useful-java-links

Java resource collection

A curated list of useful Java resources, including frameworks, libraries, and examples, aimed at software developers

A list of useful Java frameworks, libraries, software and hello worlds examples

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Spring framework 56,694 4 days ago The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications -- on any kind of deployment platform. A key element of Spring is infrastructural support at the application level: Spring focuses on the "plumbing" of enterprise applications so that teams can focus on application-level business logic, without unnecessary ties to specific deployment environments. License: , , stackoverflow - more
Google Guava 50,204 7 days ago The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.Requires JDK 1.6 or higher (as of 12.0). License: ,
Apache Commons Apache Commons is an Apache project focused on all aspects of reusable Java components.Commons Proper is dedicated to one principal goal: creating and maintaining reusable Java components. License:
Spring Boot 75,254 3 days ago — Spring Boot makes it easy to create Spring-powered, production-grade applications and services with absolute minimum fuss. It takes an opinionated view of the Spring platform so that new and existing users can quickly get to the bits they need. License: ,
Lombok 12,921 6 days ago Very spicy additions to the Java programming language. Project Lombok makes java a spicier language by adding 'handlers' that know how to build and compile simple, boilerplate-free, not-quite-java code. License: ,
Puniverse Quasar 4,565 10 months ago Fibers, Channels and Actors for the JVM. . License: Eclipse Public v1.0/ ,
Rootbeer GPU Compiler The Rootbeer GPU Compiler lets you use GPUs from within Java. License: ,
Oblac Jodd 4,061 7 months ago Jodd is set of open-source Java micro frameworks and tools; floppy size! Jodd = tools + ioc + mvc + db + aop + tx + json + html < 1.5 Mb. License: ,
Google Jimfs 2,442 17 days ago An in-memory file system for Java 7+. License: ,
Spring batch 2,733 24 days ago Spring Batch is a framework for writing offline and batch applications using Spring and Java. License: ,
Microserver 941 over 1 year ago — A convenient Microservices plugin system for Spring & Spring Boot, with over 30 plugins and growing, that supports both micro-monolith and pure microservices styles. License: ,
Greenrobot common 1,359 over 3 years ago General purpose utilities and hash functions for Android and Java (aka java-common). License: ,
Kilim 1,781 over 2 years ago Lightweight threads for Java, with message passing, nio, http and scheduling support. License: ,
Apache Isis Apache Isis is a framework for rapidly developing domain-driven apps in Java. Write your business logic in entities, domain services and repositories, and the framework dynamically (at runtime) generates a representation of that domain model as a webapp or as a RESTful API. For prototyping or production. License:
Apache Zest Apache Zest is a community based effort exploring Composite Oriented Programming for domain centric application development. This includes evolved concepts from Aspect Oriented Programming, Dependency Injection and Domain Driven Design. License:
Embedchain-JS 318 about 1 year ago Framework to easily create LLM powered bots over any dataset
Play Framework 12,558 7 days ago The Play Framework combines productivity and performance making it easy to build scalable web applications with Java and Scala. . License: ,
Spark 9,651 about 1 year ago Spark - a Sinatra inspired web framework. License: ,
Blade 5,846 4 months ago a simple, elegant java web framework! License: ,
Atmosphere 3,693 14 days ago Realtime Client Server Framework for the JVM, supporting WebSockets with Cross-Browser Fallbacks. License: CDDL1 / ,
Grails 2,790 4 days ago Grails is a framework used to build web applications with the Groovy programming language. The core framework is very extensible and there are numerous plugins available that provide easy integration of add-on features. License: ,
Ninja 1,910 12 months ago Ninja is a full stack web framework for Java. Rock solid, fast and super productive. . . License: ,
Electronicarts Orbit 14 over 8 years ago — Orbit - Virtual actor framework for building distributed systems. License: ,
Ratpack 1,945 10 days ago Ratpack is a simple, capable, toolkit for creating high performance web applications. Ratpack is built on Java and the Netty event-driven networking engine. The API is optimized for Groovy and Java 8.. License: ,
Vaadin 556 8 days ago — Vaadin is a Java framework for building modern web applications that look great, perform well and make you and your users happy. License: ,
ZK framework 438 3 days ago ZK is a highly productive Java framework for building amazing enterprise web and mobile applications. License: ,
Apache Tapestry A component-oriented framework for creating highly scalable web applications in Java. License:
Apache Wicket Open Source Java web framework that powers thousands of web applications and web sites for governments, stores, universities, cities, banks, email providers, and more. License:
Google Web Toolkit GWT is used by many products at Google, including Google AdWords and Google Wallet. It's open source, completely free, and used by thousands of enthusiastic developers around the world. License:
Pippo It's an open source micro web framework in Java, with minimal dependencies and a quick learning curve.The goal of this project is to create a micro web framework in Java that should be easy to use and hack. Pippo can be used in small and medium applications and also in applications based on micro services architecture. License:
Spring MVC Spring MVC web application and RESTful web service framework. License:
JavaServer Faces JavaServer™ Faces technology simplifies building user interfaces for JavaServer applications. License: or
JavaServer Pages This project provides a container independent implementation of JSP 2.1. License: or
Apache Cocoon Web development framework: separation of concerns, component-based. License:
Apache Struts Apache Struts is a free open-source framework for creating Java web applications. License:
Apache Sling Innovative Web framework based on JCR and OSGi. License:
Apache MyFaces The first free open source JavaServer(tm) Faces implementation. License:
Apache Pivot Apache Pivot is an open-source platform for building installable Internet applications (IIAs) [rich Internet application]. License:
Apache Turbine Turbine is a servlet based framework that allows Java developers to quickly build web applications. License:
Apache OODT Apache OODT software is component based, and offers a software architecture beyond simple science applications. License:
VRaptor 350 6 months ago VRaptor 4 delivers high productivity to your Java Web applications on top of CDI. VRaptor is an opensource MVC framework with a large developers and users community, . . License:
Jooby 1,711 4 days ago Scalable, fast and modular micro web framework for Java , . . License:
CUBA Platform 1,343 8 months ago High-level framework for developing enterprise applications with a rich web interface, based on Spring, EclipseLink and Vaadin. . License:
Jersey Jersey RESTful Web Services framework is open source, production quality, framework for developing RESTful Web Services in Java that provides support for JAX-RS APIs and serves as a JAX-RS (JSR 311 & JSR 339) Reference Implementation
Tobie ua-parser 1,973 almost 8 years ago A multi-language port of Browserscope's user agent parser. License: / /Perl,
Ghost Driver 1,914 almost 6 years ago Ghost Driver is an implementation of the Remote WebDriver Wire protocol, using PhantomJS as back-end. License: ,
B3log Solo A blogging system written in Java, feel free to create your or your team own blog. License: ,
Nasher 15 over 6 years ago A Spring Project with spring security support with angular admin panel. License: ,
Baasbox 790 almost 6 years ago BaasBox is an Open Source project that aims to provide a backend for mobile and web apps. License: ?,
Kolorobot Spring MVC 4 Quickstart Maven Archetype 1,048 almost 2 years ago — The project is a Maven archetype for Spring MVC 4 web application. License: ?,
Gargl 513 about 8 years ago Record web requests as they happen and turn them into reusable code in any programming language. Gargl - Generic API Recorder and Generator Lite. Pronounced "Gargle." Automate any website. Record web requests as they happen and turn them into reusable code in any programming language. License: ,
Liferay plugins 509 about 1 year ago The liferay-plugins repository is part of the Liferay Portal project. Liferay Portal is an open source enterprise web platform for building business solutions that deliver immediate results and long-term value. License: ,
Netflix Ribbon 4,578 4 months ago Ribbon is a Inter Process Communication (remote procedure calls) library with built in software load balancers. The primary usage model involves REST calls with various serialization scheme support. License: ,
Gwt bootstrap 406 almost 7 years ago A GWT Library that provides the widgets of Bootstrap, from Twitter. License: ,
Netflix Zuul 13,534 7 days ago Zuul is an edge service that provides dynamic routing, monitoring, resiliency, security, and more. License: ,
PrimeFaces PrimeUI is a pure CSS-JS library designed to work with any server side and client side technology featuring 50+ jQuery Widgets, Web Components, Premium Layouts-Themes and more. PrimeUI is an offspring project of the mighty PrimeFaces. License:
Spring Boot Spring Boot makes it easy to create Spring-powered, production-grade applications and services with absolute minimum fuss. It takes an opinionated view of the Spring platform so that new and existing users can quickly get to the bits they need. License:
CSSEmbed 389 almost 13 years ago A tool for embedding data URIs in CSS files. License: ,
Athou commafeed 2,799 7 days ago Google Reader inspired self-hosted RSS reader. License: ,
Apache Any23 Anything To Triples (Any23) is a library, a web service and a command line tool that extracts structured data in RDF format from a variety of Web. License:
Apache Forrest Apache Forrest software is a publishing framework that transforms input from various sources into a unified presentation in one or more output formats. License:
Apache Velocity Velocity is a project of the Apache Software Foundation, charged with the creation and maintenance of open-source software related to the Apache Velocity Engine (templating engine). License:
Apache FreeMarker Apache FreeMarker is a template engine: a Java library to generate text output (HTML web pages, e-mails, configuration files, source code, etc.) based on templates and changing data. License:
Handlebars.java 1,474 about 2 months ago Logic-less and semantic templates with Java, . License:
Thymeleaf It is a template engine capable of processing and generating HTML, XML, JavaScript, CSS and text, and can work both in web and non-web environments. It is better suited for serving the view layer of web applications, but it can process files in many formats, even in offline environments. License:
Mustache.java 1,901 2 months ago Implementation of mustache.js (web application templating system) for Java. License: ,
Apache Tiles Apache Tiles is a templating framework built to simplify the development of web application user interfaces. License:
Apache Stanbol Software components for semantic content management. License:
Apache JSPWiki A feature-rich and extensible WikiWiki engine built around the standard J2EE components (Java, servlets, JSP). icense:
Apache Portals The Apache Portals project provides various software products, including Apache Jetspeed-2, Apache Pluto, and Apache Portals Applications. License:
Apache Roller Apache Roller is a full-featured, multi-user and group blog server suitable for blog sites large and small. License:
Apache Chemistry Apache Chemistry provides open source implementations of the Content Management Interoperability Services (CMIS) specification. License:
Jease Jease eases the development of content- & database-driven web-applications with Java. License:
JavaFX JavaFX is the next step in the evolution of Java as a rich client platform. It is designed to provide a lightweight, hardware-accelerated Java UI platform for enterprise business applications. License:
Scene Builder JavaFX Scene Builder is a visual layout tool that lets users quickly design JavaFX application user interfaces, without coding. Users can drag and drop UI components to a work area, modify their properties, apply style sheets, and the FXML code for the layout that they are creating is automatically generated in the background. The result is an FXML file that can then be combined with a Java project by binding the UI to the application’s logic. License: . , but see Gluon Scene Builder
Gluon Scene Builder Scene Builder is free and open source JavaFX Scene Builder, but is backed by Gluon. Commercial support offerings are available, including training and custom consultancy services. License:
SWT SWT is an open source widget toolkit for Java designed to provide efficient, portable access to the user-interface facilities of the operating systems on which it is implemented. License:
Lanterna Lanterna is a Java library allowing you to write easy semi-graphical user interfaces in a text-only environment, very similar to the C library curses but with more functionality. License:
Gephi 5,930 2 months ago Gephi is an award-winning open-source platform for visualizing and manipulating large graphs. It runs on Windows, Mac OS X and Linux. Localization is available in French, Spanish, Japanese, Russian, Brazilian Portuguese, Chinese and Czech. License: or
Codename One Open-source cross-platform app development solution for writing native apps for desktop, web & mobile in Java/Kotlin. (GPL + Classpath Exception)
Codecademy EventHub 1,334 over 2 years ago — An open source event analytics platform. License: ,
Killbill 4,635 23 days ago Open-Source Subscription Billing & Payment Platform . License: ,
Activiti 10,109 7 days ago Activiti is a light-weight workflow and Business Process Management (BPM) Platform targeted at business people, developers and system admins. Its core is a super-fast and rock-solid BPMN 2 process engine for Java. License: ,
Liferay Portal 2,103 4 days ago Liferay Portal is an open source enterprise web platform for building business solutions that deliver immediate results and long-term value. Liferay Portal started out as a personal development project in 2000 and was open sourced in 2001. License: ,
Broadleaf Commerce 1,728 6 days ago Broadleaf Commerce - Enterprise eCommerce framework based on Spring. License: ,
Droolsjbpm Drools 5,879 4 days ago Drools Expert is the rule engine and Drools Fusion does complex event processing (CEP). License: ,
Spring Roo 693 about 2 years ago — Spring Roo is a next-generation rapid application development tool for Java developers. It focuses on higher productivity, stock-standard Java APIs, high usability, avoiding engineering trade-offs and facilitating easy Roo removal. License: ,
Apache OFBiz Apache OFBiz (The Apache Open For Business Project) is an open source enterprise automation software project. License:
Apache Portals The Apache Portals project provides various software products, including Apache Jetspeed-2, Apache Pluto, and Apache Portals Applications. License:
Apache ODE Apache ODE is a WS-BPEL implementation that supports web services orchestration using flexible process definitions. License:
libgdx 23,368 7 days ago Desktop/Android/HTML5/iOS Java game development framework. License: ,
Disunity 2,695 about 6 years ago An experimental toolset for Unity asset and asset bundle files. License: ,
LibGDX/LWJGL 1,872 over 5 years ago LibGDX/LWJGL tutorials and examples. License: ?,
jMonkeyEngine 3,835 23 days ago A complete 3D game development suite written purely in Java.. License: ,
Jetserver 1,275 over 2 years ago Jetserver is a high speed nio socket based multiplayer java game server written using Netty and Mike Rettig's Jetlang.It is specifically tuned for network based multiplayer games and supports TCP and UDP network protocols. License: ,
LWJGL 2.X 548 almost 2 years ago LWJGL 2.X - The Lightweight Java Game Library. License: ,
Ardor3D JogAmp’s Ardor3D Continuation is a general-purpose, professionally oriented, open source, scenegraph based 3D Java engine for desktop and embedded environments, using JOGL for its hardware graphics acceleration. Fork of jMonkeyEngine 2.0. Cross-platform. License:
DimensioneX Multiplayer Engine Produces browser games with pseudo-3D views. Games can be turned into Facebook Apps. Intended for beginners. 2.5D. Cross-platform. Notable games: Underworld Online. License:
PlayN 256 5 months ago A Java game development framework that deploys to Windows, Linux, HTML5, Android and iOS. Notable games: Angry Birds Chrome. Cross-platform. License: .
Env3D 3D game engine that creates an interface for dynamically adding EnvObjects. Built on jMonkeyEngine 2.0. Cross-platform License:
Jake2 Java port of the Quake II game engine. 2D. Cross-platform License:
Jogre JOGRE (Java Online Gaming Real-time Engine) which is an open-source, online, real-time gaming engine and API programmed entirely in Java. License:
Elflight Engine Targeted for web based games
FXGL 4,429 7 days ago JavaFX Game Development Framework. License: ,
Google Guava 50,204 7 days ago The Guava project contains several of Google's core libraries that we rely on in our Java-based projects: collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth.Requires JDK 1.6 or higher (as of 12.0). License: ,
Apache Commons Collections Commons-Collections seek to build upon the JDK classes by providing new interfaces, implementations and utilities. . License:
Gs collections 1,812 over 1 year ago A supplement or replacement for the Java Collections Framework. . License: ,
Eclipse Collections Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API, additional types not found in the JDK like Bags, Multimaps and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.Eclipse Collections started off as an open source project on GitHub called GS Collections. GS Collections has been presented at the JVM Language Summit in 2012 and JavaOne in 2014. . License:
javatuples javatuples is one of the simplest java libraries ever made. Its aim is to provide a set of java classes that allow you to work with tuples.A tuple is just a sequence of objects that do not necessarily relate to each other in any way. For example: [23, "Saturn", java.sql.Connection@li734s] can be considered a tuple of three elements (a triplet) containing an Integer, a String, and a JDBC Connection object. License:
Immutables Java annotation processors to generate simple, safe and consistent value objects. Do not repeat yourself, try Immutables, the most comprehensive tool in this field. License:
OpenHFT Chronicle Queue 3,307 6 days ago Micro second messaging that stores everything to disk. License: .0,
fastutil fastutil extends the Java™ Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files. It requires Java 7 or newer. License:
HPPC HPPC provides template-generated implementations of typical collections, such as lists, sets and maps, for all Java primitive types. The primary driving force behind HPPC is optimization for highest performance and memory efficiency. License:
Koloboke 1,007 almost 8 years ago Java Collections till the last breadcrumb of memory and performance . This library is a carefully designed and efficient extension of the Java Collections Framework with primitive specializations and more. Java 6+. License:
Trove The Trove library provides high speed regular and primitive collections for Java. License:
underscore-java 533 7 days ago Underscore-java is a java port of Underscore.js. In addition to porting Underscore's functionality, Underscore-java includes matching unit tests. License: ,
Almanac Converter An easy-to-use Java-based calendar converter - able to convert between various known calendars. License:
Joda-Time 4,982 2 months ago Joda-Time provides a quality replacement for the Java date and time classes. License: ,
ThreeTenBP 553 2 months ago Backport of functionality based on JSR-310 to Java SE 6 and 7. This is NOT an implementation of JSR-310. License:
Time4J 439 9 months ago Advanced date, time and interval library for Java. License:
Ocpsoft Prettytime 1,294 6 days ago Social Style Date and Time Formatting for Java.PrettyTime is an OpenSource time formatting library. Completely customizable, it creates human readable, relative timestamps like those seen on Digg, Twitter, and Facebook. Get started “right now!” and in over 30 languages! License: ,
threeten-extra 397 4 months ago Provides additional date-time classes that complement those in JDK 8
Spring Framework 56,694 4 days ago The Spring Framework provides a comprehensive programming and configuration model for modern Java-based enterprise applications -- on any kind of deployment platform. A key element of Spring is infrastructural support at the application level: Spring focuses on the "plumbing" of enterprise applications so that teams can focus on application-level business logic, without unnecessary ties to specific deployment environments. . License: ,
Dagger and Dagger2 7,307 about 3 years ago A fast dependency injector for Android and Java. . License: , , stackoverflow -
Google Guice 12,507 8 days ago Guice (pronounced 'juice') is a lightweight dependency injection framework for Java 6 and above, brought to you by Google. . License: ,
Apache DeltaSpike DeltaSpike consists of a number of portable CDI extensions that provide useful features for Java application developers. We will also ensure true portability! We are testing DeltaSpike on different CDI implementations like Apache OpenWebBeans and JBoss Weld, and also on different Java EE servers like Apache Tomcat and TomEE, JBoss AS7, WildFly 8.x and 9.x, Oracle GlassFish 3.1+ and 4.x+, IBM WebSphere 8.x, Oracle WebLogic Server 12c, Jetty, and others. License:
HK2 A light-weight and dynamic dependency injection framework. /
Eclipse AspectJ AspectJ is a seamless aspect-oriented extension to the Java programming language, Java platform compatible, easy to learn and use. License:
jcommander 1,966 25 days ago Command line parsing framework for Java. License: ,
Jline 713 about 4 years ago JLine is a Java library for handling console input. It is similar in functionality to BSD editline and GNU readline. People familiar with the readline/editline capabilities for modern shells (such as bash and tcsh) will find most of the command editing features of JLine to be familiar. License: ,
args4j args4j is a small Java class library that makes it easy to parse command line options/arguments in your CUI application. License:
CRaSH The shell for the Java Platform Open source and open minde. License:
picocli Annotation based command line parser with strong typing for both options and positional args and support for git-like subcommands. Usage help with ANSI colors. Easily included as source to avoid external dependencies. License:
Retrolambda 3,540 about 1 year ago Backport of Java 8's lambda expressions to Java 7, 6 and 5. License: ,
Vavr 5,743 6 days ago Vavr (formerly called Javaslang) is a functional library for Java 8+. It helps to reduce the amount of code and to increase the robustness. A first step towards functional programming is to start thinking in immutable values. Vavr provides immutable collections and the necessary functions and control structures to operate on these values, . License:
jOOλ 2,091 4 months ago jOOλ - The Missing Parts in Java 8 jOOλ improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams, . License:
Functional Java 1,604 over 1 year ago Functional Java is an open source library facilitating functional programming in Java. The library implements numerous basic and advanced programming abstractions that assist composition oriented development. Functional Java also serves as a platform for learning functional programming concepts by introducing these concepts using a familiar language. License: ,
Cyclops react 1,318 over 1 year ago A comprehensive functional reactive platform for JDK8. Future & functional based programming via JDK compatible extensions for Java 8 and above, . License:
Fugue -Java 8 has standardised some of the basic function interfaces, but does not include quite a few more tools that a functional programmer may expect to be available. This library attempts to fill in some of the gaps when using Java 8. In particular it provides Option and Either types as well as a Pair. There also additional helper classes for common Function, Supplier, and Iterable operations. License:
TotallyLazy 318 over 2 years ago Another functional library for Java , License: ,
derive4j 567 almost 2 years ago Java 8 annotation processor and framework for deriving algebraic data types constructors, pattern-matching, morphisms, (near future: optics and typeclasses), . License:
ReactiveX RxJava 47,919 3 days ago RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM. License: , , stackoverflow -
Eclipse Vert.x 14,316 4 days ago Vert.x is a tool-kit for building reactive applications on the JVM . License:  Eclipse Public 1 /  , , stackoverflow -
Reactive Streams 4,806 8 months ago The purpose of Reactive Streams is to provide a standard for asynchronous stream processing with non-blocking backpressure. License: ,
Reactor Reactor is a second-generation Reactive library for building non-blocking applications on the JVM based on the Reactive Streams Specification. License:
RSocket RSocket is a binary protocol for use on byte stream transports such as TCP, WebSockets, and Aeron. License: ,
OTP-Java 191 about 1 year ago A small one-time password generator library according to RFC 4226 (HOTP) and RFC 6238 (TOTP)
Scribe Java 5,438 5 months ago Simple OAuth library for Java. License: ,
Spring security oauth 4,695 over 2 years ago Support for adding OAuth1(a) and OAuth2 features (consumer and provider) for Spring web applications. License: ,
Jasig CAS (Central Authentication Service) 10,923 3 days ago Apereo CAS - Single Sign On for the Web.The Central Authentication Service (CAS) is the standard mechanism by which web applications should authenticate users. License: ,
Spring security 8,827 5 days ago — Spring Security provides security services for the Spring IO Platform. Spring Security 3.1 requires Spring 3.0.3 as a minimum and also requires Java 5. License: ,
Play Authenticate 807 almost 4 years ago An authentication plugin for Play Framework 2.x (Java). License: ,
Apache Shiro Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, cryptography, and session management. With Shiro’s easy-to-understand API, you can quickly and easily secure any application – from the smallest mobile applications to the largest web and enterprise applications. License:
Bouncy Castle Legion of the Bouncy Castle Java cryptography APIs.A lightweight cryptography API. License:
Cryptomator Free client-side encryption for your cloud files. Open source software: No backdoors, no registration. License:
Google Keyczar 1,097 over 5 years ago Easy-to-use crypto toolkit. License:
Keycloak Integrated SSO and IDM for browser apps and RESTful web services. Built on top of the OAuth 2.0, Open ID Connect, JSON Web Token (JWT) and SAML 2.0 specifications. Keycloak has tight integration with a variety of platforms and has a HTTP security proxy service where we don't have tight integration. Options are to deploy it with an existing app server, as a black-box appliance, or as an Openshift cloud service and/or cartridge. License:
PicketLink Simplified Security and Identity management for Java Applications PicketLink is an umbrella project for security and identity management for Java Applications. It is licensed under a friendly Apache v2 license. License:
Santuario Library implementing XML Digital Signature Specification & XML Encryption Specification. License:
Apache Oltu ( ) Apache Oltu is an OAuth protocol implementation in Java. License:
Apache Syncope Apache Syncope is an Open Source system for managing digital identities in enterprise environments. License:
JObfuscator JObfuscator is a source code obfuscator for the Java language to protect Java source code & algorithms from hacking, cracking, reverse engineering, decompilation & technology theft. License:
OpenAM Access management solution that includes authentication, SSO, authorization, federation, entitlements and web services security. License: ,
Agrona 2,875 10 days ago High Performance data structures and utility methods for Java and C++, License:
Disruptor Inter-thread messaging library. License:
fastutil fastutil extends the Java Collections Framework by providing type-specific maps, sets, lists and queues with a small memory footprint and fast access and insertion; provides also big (64-bit) arrays, sets and lists, and fast, practical I/O classes for binary and text files. License:
Eclipse Collections (older GS Collections) 1,812 over 1 year ago Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework. The library modules in GS Collections are compatible with Java 5. License:
HPPC -HPPC provides template-generated implementations of typical collections, such as lists, sets and maps, for all Java primitive types. The primary driving force behind HPPC is optimization for highest performance and memory efficiency. License:
Javolution ibrary for real-time and embedded systems. License:
JCTools 3,583 6 months ago Concurrency tools currently missing from the JDK. License:
Koloboke 1,007 almost 8 years ago Hash sets and hash maps. License:
Trove Primitive collections. License:
JUnion 176 9 months ago Delivers struct types for Java programming language. 64 bit addressable struct arrays. License: [License:
Square Okio 8,806 7 days ago A modern I/O API for Java. License: ,
Square type 2,467 over 1 year ago A lightning fast, transactional, file-based FIFO for Android and Java. License: ,
Simple Binary Encoding (SBE) 3,117 8 days ago Simple Binary Encoding (SBE) - High Performance Message Codec. License: ,
MessagePack 1,416 16 days ago MessagePack serializer implementation for Java. License: ,
FlatBuffers 23,350 9 days ago Memory efficient serialization library that can access serialized data without unpacking and parsing it. License:
FST 1,590 over 1 year ago JDK compatible high performance object graph serialization. License:
Kryo 6,202 17 days ago Fast and efficient object graph serialization framework. License:
Graylog2 server 7,426 6 days ago Free and open source log management. License: ,
logback 3,016 16 days ago The reliable, generic, fast and flexible logging framework for Java.. . License: / ,
slf4j 2,340 about 1 month ago Abstraction layer which is to be used with an implementation. License: ,
Apache Log4j 2 Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor. License:
graylog Open-source aggregator suited for extended role and permission management. License:
Elastic Kibana Analyzes and visualizes log files. Some features require payment. License:
Elastic Logstash Tool for managing log files. License:
Metrics 7,844 10 days ago Expose metrics via JMX or HTTP and can send them to a database. License:
tinylog Lightweight logging framework with static logger class. License:
Dozer 2,088 about 1 month ago Dozer is a Java Bean to Java Bean mapper that recursively copies data from one object to another. . License: ,
MapStruct 7,133 8 days ago An annotation processor for generating type-safe bean mappers. . License: ,
ModelMapper 2,287 3 months ago -Simple, Intelligent, Object Mapping. . License: ,
Orika 1,295 about 1 month ago Simpler, better and faster Java bean mapping framework. . License: ,
Selma 213 almost 5 years ago Stupid Simple Statically Linked Mapper. . Selma Java bean mapping that compiles. License: ,
Apache BVal Apache BVal delivers an implementation of the Java Bean Validation (JSR303) Specification which is TCK compliant, works on Java SE 5 or later. License:
OVal – is a pragmatic and extensible validation framework for any kind of Java objects. Not JSR303/JSR380 compliant but supports Bean Validation constraints. It's pretty old flexible and reliable. License:
Facebook Rebound 5,430 over 5 years ago A Java library that models spring dynamics and adds real world physics to your app. License: ,
Processing 6,480 4 months ago Source code for the Processing Development Environment (PDE) . License: ,
JavaCV 7,585 9 days ago JavaCV uses wrappers from the JavaCPP Presets of commonly used libraries by researchers in the field of computer vision (OpenCV, FFmpeg, libdc1394, PGR FlyCapture, OpenKinect, videoInput, ARToolKitPlus, and flandmark), and provides utility classes to make their functionality easier to use on the Java platform, including Android. License: ,
imgscalr 1,228 about 1 year ago Simple Java image-scaling library implementing Chris Campbell's incremental scaling algorithm as well as Java2D's "best-practices" image-scaling techniques. License: ,
webcam-capture 2,274 3 months ago Project goal is to give users possibility to access build-in or connected via USB webcams or remote IP / network cameras directly from Java code. Using provided libraries user is able to read camera images and detect motion. License: ,
Thumbnailator 5,181 10 months ago Thumbnailator's fluent interface can be used to perform fairly complicated thumbnail processing task in one simple step
zxing 32,837 30 days ago ZXing ("zebra crossing") is an open-source, multi-format 1D/2D barcode image processing library implemented in Java, with ports to other languages. License: ,
Google Auto 10,434 8 days ago A collection of source code generators for Java. License: ,
Square Javapoet 10,829 about 1 month ago JavaPoet is a Java API for generating .java source files. License: ,
Byte buddy 6,287 9 days ago Runtime code generation for the Java virtual machine. License: ,
ASM ASM is an all purpose Java bytecode manipulation and analysis framework. It can be used to modify existing classes or dynamically generate classes, directly in binary form. Provided common transformations and analysis algorithms allow to easily assemble custom complex transformations and code analysis tools. License: / License:
Byteman Byteman is a tool which makes it easy to trace, monitor and test the behaviour of Java application and JDK runtime code. It injects Java code into your application methods or into Java runtime methods without the need for you to recompile, repackage or even redeploy your application. License:
Javassist -Javassist (Java Programming Assistant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java; it enables Java programs to define a new class at runtime and to modify a class file when the JVM loads it. License: or or
ADT4J 144 over 6 years ago This library implements Algebraic Data Types for Java. ADT4J provides annotation processor for @GenerateValueClassForVisitor annotation. ADT4J generates new class for each @GenerateValueClassForVisitor annotation. License:
JHipster 21,563 6 days ago Hipster stack for Java developers. Spring Boot + AngularJS in one handy generator. License:
cglib 4,805 3 months ago cglib - Byte Code Generation Library is high level API to generate and transform Java byte code. It is used by AOP, testing, data access frameworks to generate dynamic proxy objects and intercept field access. License:
Akka Akka is a toolkit and runtime for building highly concurrent, distributed, and resilient message-driven applications on the JVM. License:
Apache Storm 6,603 8 days ago Apache Storm is a free and open source distributed realtime computation system. Storm makes it easy to reliably process unbounded streams of data, doing for realtime processing what Hadoop did for batch processing. Storm is simple, can be used with any programming language, and is a lot of fun to use! . License:
Twitter Heron 3,643 over 1 year ago Heron is realtime analytics platform developed by Twitter. It is the direct successor of Apache Storm, built to be backwards compatible with Storm's topology API but with a wide array of architectural improvements. . License:
Apache ZooKeeper ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications. License:
Alibaba Dubbo 40,517 6 days ago Dubbo is a distributed service framework empowers applications with service import/export capability with high performance RPC. License: ,
Netflix Curator 2,155 over 1 year ago ZooKeeper client wrapper and rich ZooKeeper framework. License: ,
Axon Framework The axon framework is focussed on making life easier for developers that want to create a java application based on the CQRS principles. The framework is used in a lot of environments. License:
Hazelcast The Leading Open Source In-Memory Data Grid: Distributed Computing, Simplified. License:
Netflix Hystrix 24,141 about 1 year ago Hystrix is a latency and fault tolerance library designed to isolate points of access to remote systems, services and 3rd party libraries, stop cascading failure and enable resilience in complex distributed systems where failure is inevitable, . License:
JGroups JGroups is a toolkit for reliable messaging. It can be used to create clusters whose nodes can send messages to each other. License:
Orbit 9 about 2 years ago Orbit is a modern framework for JVM languages that makes it easier to build and maintain distributed and scalable online services. It was developed by BioWare, a division of Electronic Arts. License:
Quasar Quasar is an open source JVM library that greatly simplifies the creation of highly concurrent software that is very easy to write and reason about, performant, and fault tolerant. License: or
Storm contrib 579 about 2 years ago A collection of spouts, bolts, serializers, DSLs, and other goodies to use with Storm. License: ,
JADE JADE (Java Agent DEvelopment Framework) is a software Framework fully implemented in the Java language. It simplifies the implementation of multi-agent systems through a middle-ware that complies with the FIPA specifications and through a set of graphical tools that support the debugging and deployment phases. License:
Apache River Apache River software provides a standards-compilani JINI service. License:
Apache Tuscany Apache Tuscany simplifies the task of developing SOA solutions by providing a comprehensive infrastructure for SOA development and management that is based on Service Component Architecture (SCA) standard. License:
Lagom 2,632 over 1 year ago Reactive Microservices for the JVM. . License: ,
DataMelt DataMelt is a free mathematics software for scientists, engineers and students. It can be used for numeric computation, statistics, symbolic calculations, data analysis and data visualization. License:
JGraphT 2,611 30 days ago JGraphT is a free Java class library that provides mathematical graph-theory objects and algorithms. It runs on Java 2 Platform (requires JDK 1.7 or later). License: or
JScience Provides a set of classes to work with scientific measurements and units. License:
Michael Thomas Flanagan's Java Scientific Library General classes of a Java scientific and numerical library written by Michael Thomas Flanagan to support both his own research and his undergraduate programming courses and projects. License: only for non-commercial use
ACE Apache ACE is a software distribution framework that allows you to centrally manage and distribute software components, configuration data and other artifacts to target systems. It is built using OSGi and can be deployed in different topologies. The target systems are usually also OSGi based, but don't have to be. License:
Aries The Aries project consists of a set of pluggable Java components enabling an enterprise OSGi application programming model. License:
Felix OSGi framework implementation and related technologies. License:
Karaf Apache Karaf is an OSGi distribution for server-side applications. License:
Equinox OSGI framework implementation and related technologies. License:
Eclipse Virgo OSGI based server that is designed to run enterprise Java applications and Spring-powered applications. License:
Thinkaurelius Titan 5,249 about 2 years ago Titan is a highly scalable graph database optimized for storing and querying large graphs with billions of vertices and edges distributed across a multi-machine cluster. Titan is a transactional database that can support thousands of concurrent users, complex traversals, and analytic graph queries. License: ,
Apache Cassandra 8,858 6 days ago Cassandra is a partitioned row store. Rows are organized into tables with a required primary key. License: ,
Orientdb 4,751 7 days ago OrientDB is the first Multi-Model DBMS with Document & Graph engine. OrientDB can run distributed (Multi-Master), supports SQL, ACID Transactions, Full-Text indexing, Reactive Queries and has a small memory footprint. OrientDB is licensed with Apache 2 license and the development is driven by OrientDB LTD and a worldwide Open Source community. License: /CDDL 1/Eclipse Distribution 1.0,
Neo4j 13,406 21 days ago — Neo4j is the world’s leading Graph Database. It is a high performance graph store with all the features expected of a mature and robust database, like a friendly query language and ACID transactions. License: / ,
Mapdb 4,906 6 months ago MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine. . License: ,
Voldemort 2,640 over 1 year ago An open source clone of Amazon's Dynamo. Voldemort is a distributed key-value storage system. License: ,
Alluxio (formerly Tachyon) 6,861 10 days ago Memory-Speed Virtual Distributed Storage System. License: ,
Opentsdb 5,005 about 2 months ago A scalable, distributed Time Series Database. License: ,
Hazelcast 6,152 6 days ago Open Source In-Memory Data Grid. License: ,
Tinkerpop Blueprints 1,365 over 3 years ago A Property Graph Model Interface. It provides implementations, test suites, and supporting extensions. Graph databases and frameworks that implement the Blueprints interfaces automatically support Blueprints-enabled applications. Likewise, Blueprints-enabled applications can plug-and-play different Blueprints-enabled graph backends. License: ,
Apache Lucene solr 4,374 about 2 months ago Apache Lucene/Solr. Lucene is a search engine library Solr is a search engine server that uses lucene. License: ,
Java Chronicle 1,221 about 4 years ago Java Indexed Record Chronicle — This library is an ultra low latency, high throughput, persisted, messaging and event driven in memory database. License: ,
Torodb 12 over 7 years ago ToroDB - Open source NoSQL database that runs on top of a RDBMS. Compatible with MongoDB protocol and APIs, but with support for native SQL, atomic operations and reliable and durable backends like PostgreSQL. License: ,
Crate 4,119 6 days ago Crate.IO: The fast, scalable, easy to use SQL database with native full text search. .License: ,
Linkedin Pinot 5,511 5 days ago A realtime distributed OLAP datastore. Pinot is a realtime distributed OLAP datastore, which is used at LinkedIn to deliver scalable real time analytics with low latency. License: ,
Solandra 883 over 8 years ago Solandra is a real-time distributed search engine built on Apache Solr and Apache Cassandra. License: ,
Voltdb VoltDB is a horizontally-scalable, in-memory SQL RDBMS designed for applications that have extremely high read and write throughput requirements. License: ,
Leveldb 1,529 about 2 years ago This is a rewrite (port) of LevelDB in Java. This goal is to have a feature complete implementation that is within 10% of the performance of the C++ original and produces byte-for-byte exact copies of the C++ code.. License: ,
Kairosdb 1,740 7 months ago KairosDB is a fast distributed scalable time series database written on top of Cassandra. License: ,
Linkedin Sensei 542 over 10 years ago Sensei is a distributed, elastic realtime searchable database. License: ,
Elephantdb 558 over 10 years ago Distributed database specialized in exporting key/value data from Hadoop. License: ,
Apache Drill 1,945 6 days ago Apache Drill is a distributed MPP query layer that supports SQL and alternative query languages against NoSQL and Hadoop data storage systems. License: ,
Tinkerpop Rexster 433 11 months ago Rexster is a graph server that exposes any Blueprints graph through HTTP/REST and a binary protocol called RexPro. Extensions support standard traversal goals such as search, score, rank, and, in concert, recommendation. License: ,
Tomcat redis session manager 1,799 almost 2 years ago Redis-backed non-sticky session store for Apache Tomcat. License: ,
Embulk 1,755 about 2 months ago Embulk is a parallel bulk data loader that helps data transfer between various storages, databases, NoSQL and cloud services. License: ,
H2 Welcome to H2, the Java SQL database. The main features of H2 are: Very fast, open source, JDBC API, Embedded and server modes; in-memory databases, Browser based Console application,Small footprint: around 1.5 MB jar file size License: and
Apache Derby Apache Derby, an Apache DB subproject, is an open source relational database implemented entirely in Java. Derby provides an embedded JDBC driver that lets you embed Derby in any Java-based solution. License:
Apache Empire-db Apache Empire-db is a lightweight relational database abstraction layer and data persistence component. License:
Apache Ignite Apache Ignite is an In-Memory Data Fabric providing in-memory data caching, partitioning, processing, and querying components. License:
Tarantool 3,418 8 days ago — is an open-source NoSQL database management system and Lua application server. It maintains databases in memory and ensures crash resistance with write-ahead logging. It includes a Lua interpreter and interactive console but also accepts connections from programs in several other languages. License:
Apache Cassandra 8,858 6 days ago The Apache Cassandra database is the right choice when you need scalability and high availability without compromising performance. License: ,
Apache HBase Apache HBase is an open-source, distributed, versioned, non-relational database modeled after Google's Bigtable: A Distributed Storage System for Structured Data by Chang et al. License:
Druid 13,513 6 days ago Druid is a fast column-oriented distributed data store. License: ,
Infinispan Infinispan is a distributed in-memory key/value data store with optional schema. It can be used both as an embedded Java library and as a language-independent service accessed remotely over a variety of protocols (HotRod, REST, Memcached and WebSockets). License:
OpenTSDB 5,005 about 2 months ago The Scalable Time Series Database Store and serve massive amounts of time series data without losing granularity. License: ,
Apache Avro Apache Avro is a data serialization system. License:
Apache Orc The smallest, fastest columnar storage for Hadoop workloads. License:
Apache Parquet Apache Parquet is a columnar storage format available to any project in the Hadoop ecosystem, regardless of the choice of data processing framework, data model or programming language. License:
Apache Thrift -The Apache Thrift software framework, for scalable cross-language services development, combines a software stack with a code generation engine to build services that work efficiently and seamlessly between C++, Java, Python, PHP, Ruby, Erlang, Perl, Haskell, C#, Cocoa, JavaScript, Node.js, Smalltalk, OCaml and Delphi and other languages. License:
Persistent Collection PCollections serves as a persistent and immutable analogue of the Java Collections Framework. License:
Protobuf 65,753 6 days ago Protocol Buffers (a.k.a., protobuf) are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data. License:
SBE 3,117 8 days ago Simple Binary Encoding (SBE) - High Performance Message Codec, License:
Wire 4,255 6 days ago Clean, lightweight protocol buffers for Android and Java. License:
Elasticsearch 1,205 6 days ago Elasticsearch is a distributed RESTful search engine built for the cloud. License: ,
Linkedin Indextank Engine 844 over 12 years ago This project contains IndexTank ( ) search engine implementation. Includes features like variables (boosts), categories (facets), faceted search, snippeting, custom scoring functions, suggest, and autocomplete. License: ,
Apache Solr 4,374 about 2 months ago Solr is the popular, blazing-fast, open source enterprise search platform built on Apache Lucene. License: ,
Linkedin Cleo 565 about 11 years ago A flexible, partial, out-of-order and real-time typeahead search library. License: ,
Elasticsearch cloud aws 577 about 2 years ago AWS (Amazon Web Service) Cloud Plugin for Elasticsearch. License: ,
Elasticsearch analysis ik 16,608 about 2 months ago The IK Analysis plugin integrates Lucene IK analyzer into elasticsearch, support customized dictionary. License: ?,
Apache ManifoldCF Open-source software for transferring content between repositories or search indexes License:
Lemur Project The Lemur Project develops search engines, browser toolbars, text analysis tools, and data resources that support research and development of information retrieval and text mining software, including the Indri search engine and ClueWeb09 dataset. License:
YaCy 3,426 about 1 month ago The YaCy Search Engine application, . License: and
Facebook Presto 16,056 4 days ago Distributed SQL query engine for big data (Cassandra, Hive, Kafka, MySQL, PostgreSQL and so on). License: ,
Jedis 11,879 10 days ago A blazingly small and sane redis java client. License: ,
Tinkerpop Gremlin 1,950 over 3 years ago A Graph Traversal Language. Gremlin is a domain specific language for traversing property graphs. Gremlin makes use of Pipes to perform complex graph traversals. This language has application in the areas of graph query, analysis, and manipulation. License: ,
Mongodb Java Driver 2,616 3 days ago The Java driver for MongoDB. License: / Creative Commons Attribution ,
Yahoo Mysql_perf_analyzer 1,439 over 1 year ago MySQL Performance Analyzer is an open source project for MySQL performance monitoring and analysis. License: ,
Airbnb Airpal 2,756 over 3 years ago Web UI for PrestoDB. License: ,
Mongodb hadoop 1,520 almost 3 years ago MongoDB Connector for Hadoop. License: ?,
Elasticsearch jdbc 2,837 about 3 years ago JDBC importer for Elasticsearch. License: ,
Flyway 8,236 14 days ago — Flyway by Boxfuse. Database Migrations Made Easy. . License: ,
Elasticsearch river mongodb 1,123 almost 8 years ago MongoDB River Plugin for ElasticSearch. License: ,
Netflix Astyanax 1,039 9 months ago Cassandra Java Client. License: ,
Liquibase 4,743 6 days ago Liquibase — source control for your database, supports multiple developers, database types and so on. . License: ,
Mongodb Morphia 1,652 3 days ago MongoDB object-document mapper in Java based on. License: ,
Couchdb lucene 769 over 2 years ago Enables full-text searching of CouchDB documents using Lucene. License: ,
Forcedotcom Phoenix 558 almost 3 years ago Phoenix is a SQL skin over HBase, delivered as a client-embedded JDBC driver, powering the HBase use cases at Salesforce.com. Phoenix targets low-latency queries (milliseconds), as opposed to batch operation via map/reduce. License: ,
Variety 1,745 3 months ago A schema analyzer for MongoDB. License: ,
Redisson 23,365 6 days ago Redisson - distributed Java objects (Bloom filter, BitSet, Set, SetMultimap, ScoredSortedSet, SortedSet, Map, ConcurrentMap, List, ListMultimap, Queue, BlockingQueue, Deque, BlockingDeque, Semaphore, Lock, ReadWriteLock, AtomicLong, CountDownLatch, Publish / Subscribe, HyperLogLog), Redis pipelining on top of Redis server. License: ,
Netflix Priam 1,037 9 days ago Co-Process for backup/recovery, Token Management, and Centralized Configuration management for Cassandra. License: ,
Datastax Java driver 1,353 8 days ago DataStax Java Driver for Apache Cassandra. License: ,
Memcached Java Client 662 almost 8 years ago to be the best java client for memcached. License: ,
Spring data mongodb 1,623 6 days ago Provide support to increase developer productivity in Java when using MongoDB. Uses familiar Spring concepts such as a template classes for core API usage and lightweight repository style data access. License: ,
Apache Phoenix Apache Phoenix enables OLTP and operational analytics in Hadoop for low latency applications by combining the best of both worlds, License:
FlexyPool 1,094 25 days ago FlexyPool adds metrics and failover strategies to a given Connection Pool, allowing it to resize on demand. License:
LightAdmin Pluggable data administration UI library for Java web applications. License:
Jaybird JCA/JDBC driver 91 9 days ago JCA-JDBC Driver for Firebird database. , . License:
dbeaver 40,507 3 days ago Free universal database manager and SQL client. . , . License:
tarantool-java 51 almost 2 years ago A Java client for Tarantool. License:
HikariCP 20,010 12 days ago A solid high-performance JDBC connection pool at last. License: ,
Mybatis 3 19,796 12 days ago MyBatis SQL mapper framework for Java. License: ,
Hibernate orm 5,989 4 days ago Hibernate's core Object/Relational Mapping functionality. License: ,
JOOQ 6,170 6 days ago OOQ is an innovative solution for a better integration of Java applications with popular databases like Oracle, Microsoft SQL Server, IBM DB2, or SAP Sybase. . License: ,
Querydsl 4,749 3 months ago Querydsl is a framework which enables the construction of type-safe SQL-like queries for multiple backends including JPA, MongoDB and SQL in Java. . License: ,
Kundera 903 almost 5 years ago A JPA 2.1 compliant Polyglot Object-Datastore Mapping Library for NoSQL Datastores. License: ,
Spring data jpa 3,010 3 days ago Simplifies the development of creating a JPA-based data access layer. License: ,
Jdbi 1,985 16 days ago jDBI is designed to provide convenient tabular data access in Java(tm). It uses the Java collections framework for query results, provides a convenient means of externalizing sql statements, and provides named parameter support for any database being used. .License: ,
ActiveJDBC 855 9 days ago ActiveJDBC is a fast and lean Java ORM. License: ,
Vibur DBCP Concurrent, fast, and fully-featured JDBC connection pool, which provides a non-starvation guarantee for application threads, statement caching, slow SQL queries detection and logging, and Hibernate integration, among other features. License:
Ebean Ebean ORM for Java/Kotlin.Fast and simple data access on the JVM. License:
EclipseLink Comprehensive open-source Java persistence solution addressing relational, XML, and database web services. License: and
OrmLite Object Relational Mapping Lite (ORM Lite) provides some simple, lightweight functionality for persisting Java objects to SQL databases while avoiding the complexity and overhead of more standard ORM packages. License:
Apache Cayenne User-friendly Java ORM with tools. License:
Apache OpenJPA Java Persistence API Implementation. License:
Apache MetaModel With MetaModel you get a uniform connector and query API to many very different datastore types, including: Relational (JDBC) databases, CSV files, Excel spreadsheets, XML files, JSON files, Fixed width files, MongoDB, Apache CouchDB, Apache HBase, Apache Cassandra, ElasticSearch, OpenOffice.org databases, Salesforce.com, SugarCRM and even collections of plain old Java objects (POJOs). License:
Storm 8,829 over 7 years ago Distributed and fault-tolerant realtime computation: stream processing, continuous computation, distributed RPC, and more. License: ,
OpenRefine 10,914 3 days ago — OpenRefine is a free, open source power tool for working with messy data and improving it. License: ,
Addthis Stream lib 2,260 almost 5 years ago Stream summarizer and cardinality estimator. License: ,
HdrHistogram (A High Dynamic Range (HDR) Histogram ) 2,174 5 months ago — HdrHistogram: A High Dynamic Range (HDR) Histogram: HdrHistogram supports the recording and analyzing of sampled data value counts across a configurable integer value range with configurable value precision within the range. License: ,
HazyResearch DeepDive 1,958 over 2 years ago DeepDive is a system to extract value from dark data. Like dark matter, dark data is the great mass of data buried in text, tables, figures, and images, which lacks structure and so is essentially unprocessable by existing software. License: ,
Apache Incubator Zeppelin 6,414 6 days ago Zeppelin, a web-based notebook that enables interactive data analytics. You can make beautiful data-driven, interactive and collaborative documents with SQL, Scala and more. License: ,
Seldon Server 1,473 over 4 years ago Enterprise machine learning platform for prediction and recommendation on Apache Spark. License: ,
Pulsar 652 about 9 years ago Realtime analytics, this includes the core components of Pulsar pipeline. License: .0,
Suro: Netflix's Data Pipeline 794 over 1 year ago — Suro: Netflix's Data Pipeline. Suro is a data pipeline service for collecting, aggregating, and dispatching large volume of application events including log data. License: ,
Apache UIMA Annotator components and a scalable integration and deployment framework for Unstructured Information analysis. License:
Apache Storm 6,603 8 days ago Storm is a distributed realtime computation system. Similar to how Hadoop provides a set of general primitives for doing batch processing, Storm provides a set of general primitives for doing realtime computation.License: ,
Twitter Heron 3,643 over 1 year ago Heron is realtime analytics platform developed by Twitter. It is the direct successor of Apache Storm, built to be backwards compatible with Storm's topology API but with a wide array of architectural improvements. . License:
H2o 2,224 28 days ago h2o = fast statistical, machine learning & math runtime for bigdata. License: ,
Cloudera Oryx The Oryx open source project provides simple, real-time large-scale machine learning / predictive analytics infrastructure. It implements a few classes of algorithm commonly used in business applications: collaborative filtering / recommendation, classification / regression, and clustering. License: ,
Twitter Elephant bird 1,138 over 1 year ago Twitter's collection of LZO and Protocol Buffer-related Hadoop, Pig, Hive, and HBase code. License: ,
Apache Hadoop 14,775 6 days ago The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. License: ,
Google Mr4c 907 about 5 years ago MR4C is an implementation framework that allows you to run native code within the Hadoop execution framework. License: ,
Alibaba Jstorm 3,914 over 1 year ago — JStorm is a distributed and fault-tolerant realtime computation system. Inspired by Apache Storm, JStorm has been completely rewritten in Java and provides many more enhanced features. JStorm has been widely used in many enterprise environments and proved robust and stable. License: ,
Etsy Oculus 707 over 7 years ago Oculus is the anomaly correlation component of Etsy's Kale system. License: ,
Linkedin Datafu 584 over 10 years ago Apache DataFu is a collection of libraries for working with large-scale data in Hadoop. The project was inspired by the need for stable, well-tested libraries for data mining and statistics. License: ,
Linkedin Gobblin 2,229 7 days ago Universal data ingestion framework for Hadoop. License: ,
Apache Flink 24,107 6 days ago Apache Flink is an open source stream processing framework with powerful stream- and batch-processing capabilities. License: ,
Oryx 2 1,788 over 3 years ago Oryx 2: Lambda architecture on Apache Spark, Apache Kafka for real-time large scale machine learning. License: ,
Yahoo SAMOA (Scalable Advanced Massive Online Analysis) 427 over 8 years ago — SAMOA (Scalable Advanced Massive Online Analysis) is an open-source platform for mining big data streams. License: ,
Curator A set of Java libraries that make using Apache ZooKeeper much easier. License:
Apache Hama Hama is an efficient and scalable general-purpose BSP computing engine. License:
Apache Falcon Data management and processing platform for Hadoop. License:
Apache Knox A REST API Gateway for Hadoop Services. License:
Apache Flume Apache Flume is a distributed, reliable, and available system for efficiently collecting, aggregating and moving large amounts of log data from many different sources to a centralized data store. License:
Apache Tajo Tajo is an open source big data warehouse system in Hadoop for processing web-scale data sets. License:
Apache Tez Apache Tez is an effort to develop a generic application framework which can be used to process arbitrarily complex directed-acyclic graphs (DAGs) of data-processing tasks and also a re-usable set of data-processing primitives which can be used by other projects. License:
Apache REEF Apache REEF (Retainable Evaluator Execution Framework) is a scale-out computing fabric that eases the development of Big Data applications on top of resource managers such as Apache YARN and Mesos. License:
Apache Pig Apache Pig is a platform for analyzing large data sets on Hadoop. License:
Druid 13,513 6 days ago Column oriented distributed data store ideal for powering interactive applications. License: ,
Apache Hive 5,554 6 days ago The Apache Hive data warehouse software facilitates querying and managing large datasets residing in distributed storage. Built on top of Apache Hadoop. .License: ,
Apache Kylin 562 about 2 years ago Apache Kylin is an open source Distributed Analytics Engine to provide SQL interface and multi-dimensional analysis (OLAP) on Hadoop supporting extremely large datasets. License: ,
Elasticsearch hadoop 9 8 days ago Elasticsearch real-time search and analytics natively integrated with Hadoop. License: ,
Facebook Presto 16,056 4 days ago Presto is a distributed SQL query engine for big data. License: ,
Apache MetaModel With MetaModel you get a uniform connector and query API to many very different datastore types, including: Relational (JDBC) databases, CSV files, Excel spreadsheets, XML files, JSON files, Fixed width files, MongoDB, Apache CouchDB, Apache HBase, Apache Cassandra, ElasticSearch, OpenOffice.org databases, Salesforce.com, SugarCRM and even collections of plain old Java objects (POJOs). License:
Apache Accumulo Apache Accumulo is based on Google’s BigTable design and is built on top of Apache Hadoop, Zookeeper, and Thrift. Apache Accumulo features a few novel improvements on the BigTable design in the form of cell-based access control and a server-side programming mechanism that can modify key/value pairs at various points in the data management process. License:
Apache Gora provides an in-memory data model and persistence for big data. Gora supports persisting to column stores, key value stores, document stores and RDBMSs, and analyzing the data with extensive Apache Hadoop MapReduce support. License:
http://sqoop.apache.org [Apache Sqoop] Apache Sqoop(TM) is a tool designed for efficiently transferring bulk data between Apache Hadoop and structured datastores such as relational databases.( ) License:
Giraph Apache Giraph is an iterative graph processing system built for high scalability. For example, it is currently used at Facebook to analyze the social graph formed by users and their connections. Лицензия:
Impala 33 almost 2 years ago Real-time Query for Hadoop. . License:
Twitter Ambrose 1,179 almost 5 years ago A platform for visualization and real-time monitoring of data workflows. License: ,
Umongo 581 almost 9 years ago Desktop app to browse and administer your MongoDB cluster. License: ,
Apache Ambari The Apache Ambari project is aimed at making Hadoop management simpler by developing software for provisioning, managing, and monitoring Apache Hadoop clusters. Ambari provides an intuitive, easy-to-use Hadoop management web UI backed by its RESTful APIs. License:
Apache Chukwa Chukwa is an open source data collection system for monitoring large distributed systems. Chukwa is built on top of the Hadoop Distributed File System (HDFS) and Map/Reduce framework and inherits Hadoop’s scalability and robustness. Chukwa also includes a flexible and powerful toolkit for displaying, monitoring and analyzing results to make the best use of the collected data. License:
Apache Bigtop Bigtop is an Apache Foundation project for Infrastructure Engineers and Data Scientists looking for comprehensive packaging, testing, and configuration of the leading open source big data components. License:
Apache BookKeeper BookKeeper is a replicated log service which can be used to build replicated state machines. A log contains a sequence of events which can be applied to a state machine. BookKeeper guarantees that each replica state machine will see all the same entries, in the same order. License:
Apache Crunch Provides a framework for writing, testing, and running MapReduce pipelines. License:
Apache MRUnit Apache MRUnit is a Java library that helps developers unit test Apache Hadoop map reduce jobs. License:
Apache Oozie Oozie is a workflow scheduler system to manage Apache Hadoop jobs. License:
Airbnb Aerosolve 4,795 about 2 months ago A machine learning library designed from the ground up to be human friendly. License: ,
Smile 6,046 6 days ago Smile (Statistical Machine Intelligence and Learning Engine) is a set of pure Java libraries of various state-of-art machine learning algorithms. Smile is self contained and requires only Java standard library. . License: ,
Deeplearning4j 13,682 6 days ago Deeplearning4J is an Apache 2.0-licensed, open-source, distributed neural net library written in Java and Scala. .License: ,
Libsvm 4,564 3 months ago Libsvm is a simple, easy-to-use, and efficient software for SVM classification and regression. It solves C-SVM classification, nu-SVM classification, one-class-SVM, epsilon-SVM regression, and nu-SVM regression. License: ,
Neuralnetworks 1,232 almost 7 years ago java deep learning algorithms and deep neural networks with gpu acceleration. License: ,
Datumbox framework 1,085 12 months ago Datumbox is an open-source Machine Learning framework written in Java which allows the rapid development of Machine Learning and Statistical applications. License: ,
Apache Mahout 2,143 7 days ago The Apache Mahout project's goal is to build an environment for quickly creating scalable performant machine learning applications. .License: ,
Encog java core 743 over 1 year ago Encog is an advanced machine learning framework that supports a variety of advanced algorithms, as well as support classes to normalize and process data. Machine learning algorithms such as Support Vector Machines, Artificial Neural Networks, Genetic Programming, Bayesian Networks, Hidden Markov Models, Genetic Programming and Genetic Algorithms are supported. License: ,
Apache Flink 24,107 6 days ago Apache Flink is an open source stream processing framework with powerful stream- and batch-processing capabilities. Subproject: - FlinkML is the Machine Learning (ML) library for Flink. License: ,
Apache Hadoop 14,775 6 days ago The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. License: ,
Apache Spark Apache Spark™ is a fast and general engine for large-scale data processing. Subproject: . License:
DeepDive DeepDive is a system to extract value from dark data. Like dark matter, dark data is the great mass of data buried in text, tables, figures, and images, which lacks structure and so is essentially unprocessable by existing software. License:
H2o 2,224 28 days ago h2o = fast statistical, machine learning & math runtime for bigdata. License: ,
JSAT 789 almost 2 years ago Java Statistical Analysis Tool, a Java library for Machine Learning. License:
Weka Weka is a collection of machine learning algorithms for data mining tasks. The algorithms can either be applied directly to a dataset or called from your own Java code. Weka contains tools for data pre-processing, classification, regression, clustering, association rules, and visualization. It is also well-suited for developing new machine learning schemes. License:
Protégé A free, open-source ontology editor and framework for building intelligent systems. License:
EvA2 A Java based framework for Evolutionary Algorithms -- formerly known as JavaEvA/EvA. License:
htm.java 310 about 3 years ago Hierarchical Temporal Memory implementation in Java - an official Community-Driven Java port of the Numenta Platform for Intelligent Computing (NuPIC). License:
JAVA-ML Java Machine Learning Library (Java-ML). License:
JSAT 789 almost 2 years ago Numerous Machine Learning algorithms for classification, regression, and clustering. License:
Meka An open source implementation of methods for multi-label classification and evaluation (extension to Weka). License:
Neuroph Neuroph is lightweight Java neural network framework. License:
rapaio 69 4 days ago statistics, data mining and machine learning toolbox in Java. License:
Apache SystemML 1,035 6 days ago flexible, scalable machine learning (ML) language. (incubator project). License:
wAlnut Object oriented model of partial human brain with 1 theorized common learning algorithm. Work in progress towards a strong emotional AI. License:
Apache Marmotta An Open Platform for Linked Data. License:
Apache Jena A framework for developing Semantic Web and Linked Data applications in Java. License:
Choco Choco is a Free and Open-Source Software dedicated to Constraint Programming. It aims at describing hard combinatorial problems in the form of Constraint Satisfaction Problems and solving them with Constraint Programming techniques. License:
JaCoP 220 12 months ago Java Constraint Programming (JaCoP) solver
OptaPlanner OptaPlanner is a constraint satisfaction solver. It optimizes business resource planning. Every organization faces scheduling puzzles: assign a limited set of constrained resources (employees, assets, time and money) to provide products or services to customers. License:
Sat4J Sat4j is a java library for solving boolean satisfaction and optimization problems. It can solve SAT, MAXSAT, Pseudo-Boolean, Minimally Unsatisfiable Subset (MUS) problems. License: and
Stanfordnlp CoreNLP 9,704 9 days ago Stanford CoreNLP provides a set of natural language analysis tools written in Java. . License: ,
Apache OpenNLP The Apache OpenNLP library is a machine learning based toolkit for the processing of natural language text. . License:
LingPipe LingPipe is tool kit for processing text using computational linguistics. License: or . or
Mallet MALLET is a Java-based package for statistical natural language processing, document classification, clustering, topic modeling, information extraction, and other machine learning applications to text. License:
Twitter Text Libraries 3,081 7 months ago This repo is a collection of libraries and conformance tests to standardize parsing of tweet text. It synchronizes development, testing, creating issues, and pull requests for twitter-text's implementations and specification. License:
NLP4J 148 over 3 years ago The NLP4J project (formerly known as ClearNLP) provides a NLP toolkit for JVM languages. This project is currently developed by the NLP Research Group at Emory University. License:
Joshua Joshua is an open-source statistical machine translation decoder for phrase-based (new in 6.0), hierarchical, and syntax-based machine translation, written in Java. It is developed at the Human Language Technology Center of Excellence at Johns Hopkins University. License:
Z-MERT Z-MERT is a software tool for minimum error rate training of machine translation systems. License:
ClearTK 129 over 1 year ago ClearTK is a framework for developing machine learning and natural language processing components within the Apache Unstructured Information Management Architecture, . License:
Apache cTAKES Apache cTAKES™ is a natural language processing system for extraction of information from electronic medical record clinical free-text. License:
The Stanford Natural Language Processing Group A Natural Language Processing Java software tools. Subproject: - A statistical parser, , , , , , , , , , . License:
Apache Tika The Apache Tika toolkit detects and extracts metadata and structured text content from various documents using existing parser libraries. License:
CMU Sphinx Open Source Speech Recognition Toolkit. License:
ARK Twitter NLP 574 11 months ago CMU ARK Twitter Part-of-Speech Tagger. License: ,
lc4j 5 about 4 years ago Language Categorization for Java: an Open Source library for finding out in which language a text has been written. License:
Wildfly 3,063 3 days ago Formerly known as JBoss and developed by Red Hat with extensive Java EE support. License: ,
Undertow 3,606 29 days ago High performance non-blocking webserver. License: ,
Apache Tomcat 7,571 6 days ago Robust all-round server for Servlet and JSP. License: ,
Nginx clojure 1,084 6 months ago Nginx module for embedding Clojure or Java or Groovy programs, typically those Ring based handlers. License: ,
Jetty 3,863 6 days ago Lightweight, small server, often embedded in projects. License: / .0,
Apache TomEE Tomcat plus Java EE. License:
WebSphere Liberty Lightweight, modular server developed by IBM
GlassFish GlassFish - World's first Java EE 7 Application Server. License: Or
Apache Geronimo Java EE Application Server. License:
Apache James The Apache Java Enterprise Mail Server (a.k.a. Apache James) is a 100% pure Java SMTP and POP3 Mail server and NNTP News server. We have designed James to be a complete and portable enterprise mail engine solution based on currently available open protocols. License:
Payara 883 3 days ago Payara Server is an open source middleware platform that supports reliable and secure deployments of Java EE (Jakarta EE) and MicroProfile applications in any environment: on premise, in the cloud or hybrid
Netty 33,476 6 days ago Framework for building high performance network applications. License: ,
Netty socketio 6,825 8 days ago Socket.IO server implemented on Java. Realtime java framework. License: ,
Grpc java 11,460 6 days ago The Java gRPC implementation. HTTP/2 based RPC . License: ,
Socket.io java client 950 over 2 years ago Socket.IO Client Implementation in Java. License: ,
Socket.io client.java 5,343 4 months ago Full-featured Socket.IO Client Library for Java, which is compatible with Socket.IO v1.0 and later. License: ,
EsotericSoftware Kryonet 1,818 over 3 years ago TCP/UDP client/server library for Java, based on Kryo. License: ,
Async Http Client 6,292 7 days ago Asynchronous HTTP and WebSocket client library. License:
Comsat 598 almost 7 years ago Integrates standard Java web-related APIs with Quasar fibers and actors. License:
Grizzly NIO framework. Used as a network layer in Glassfish. License: and
OkHttp HTTP+SPDY client. License:
Undertow Web server providing both blocking and non-blocking API’s based on NIO. Used as a network layer in WildFly. License:
Apache MINA Apache MINA is a network application framework which helps users develop high performance and high scalability network applications easily. It provides an abstract, event-driven, asynchronous API over various transports such as TCP/IP and UDP/IP via Java NIO. License:
Apache HttpComponents project is responsible for creating and maintaining a toolset of low level Java components focused on HTTP and associated protocols. HTTP transport library including support for asynchronous execution based on Java NIO. License:
LMAX Exchange Disruptor 17,498 2 months ago High Performance Inter-Thread Messaging Library. License: ,
Gifsockets 1,825 about 12 years ago Real Time communication library using Animated Gifs as a transport. License: ,
Real logic Aeron 7,401 6 days ago Efficient reliable UDP unicast, UDP multicast, and IPC message transport. License: ,
JeroMQ 2,364 15 days ago Pure Java ZeroMQ. License: ,
Metamorphosis 1,335 over 4 years ago A high available,high performance distributed messaging system. License: ,
Igniterealtime Openfire 2,867 6 days ago A XMPP server licensed under the Open Source Apache License. License: ,
Zeromq Jzmq 590 over 2 years ago Java binding for ZeroMQ. License: ,
Aeron 7,401 6 days ago Efficient reliable unicast and multicast message transport. License:
Apache ActiveMQ Message broker that implements JMS and converts synchronous to asynchronous communication, License:
Apache Camel Glues together different transport APIs via Enterprise Integration Patterns, License:
Apache Kafka High-throughput distributed messaging system, License:
Hermes Fast and reliable message broker built on top of Kafka, License:
JBoss HornetQ Clear, concise, modular and made to be embedded, License:
Smack 2,383 11 days ago Cross-platform XMPP client library. License: ,
Apache Qpid AMQP enterprise messaging implementation. License:
Apache Synapse Apache Synapse is a lightweight ESB engine and XML router. License:
Apache ServiceMix Apache ServiceMix is a flexible, open-source integration container that unifies the features and functionality of Apache ActiveMQ, Camel, CXF, and Karaf into a powerful runtime platform you can use to build your own integrations solutions. It provides a complete, enterprise ready ESB exclusively powered by OSGi. License:
Square Okhttp 45,872 6 days ago An HTTP+HTTP/2 client for Android and Java applications. License: ,
AsyncHttpClient 6,292 7 days ago Asynchronous Http and WebSocket Client library for Java. License: ,
Http request 3,356 about 1 year ago Java HTTP Request Library. License:   . ,
Nanohttpd 6,955 over 1 year ago Tiny, easily embeddable HTTP server in Java. License: ,
Http kit 2,450 17 days ago Hhttp-kit is a minimalist, event-driven, high-performance Clojure HTTP server/client library with WebSocket and asynchronous support. License: ,
Apache Zookeeper 12,248 15 days ago Mirror of Apache Hadoop ZooKeeper. License: ,
Moco 4,374 4 months ago Easy Setup Stub Server. License: ,
Webbit 817 11 months ago A Java event based WebSocket and HTTP server. License: ,
Mashape Unirest java 2,616 20 days ago Unirest in Java: Simplified, lightweight HTTP client library.. License: ,
Sshj 2,508 2 months ago ssh, scp and sftp for java. License: ,
Netflix Feign 9,506 3 days ago Feign makes writing java http clients easier. License: ,
Square Retrofit 43,109 10 days ago Type-safe REST client. License: ,
Dropwizard 8,511 10 days ago Opinionated framework for setting up modern web applications with Jetty, Jackson, Jersey and Metrics. License: ,
Swagger 7,387 3 days ago Swagger is a specification and complete framework implementation for describing, producing, consuming, and visualizing RESTful web services. License: ,
Generator jhipster 21,563 6 days ago Hipster stack for Java developers. Spring Boot + AngularJS in one handy generator. License: ,
Jersey 3 almost 4 years ago JAX-RS reference implementation. License: ,
Linkedin Rest.li 2,508 16 days ago Rest.li is a REST+JSON framework for building robust, scalable service architectures using dynamic discovery and simple asynchronous APIs. License: ,
Spring hateoas 1,039 6 days ago Spring HATEOAS - Library to support implementing representations for hyper-text driven REST web services. License: ,
Feign 9,506 3 days ago HTTP client binder inspired by Retrofit, JAXRS-2.0, and WebSocket. License:
RESTEasy Fully certified and portable implementation of the JAX-RS specification. License:
RestExpress 939 4 months ago Thin wrapper on the JBOSS Netty HTTP stack to provide scaling and performance. License:
RestX Framework based on annotation processing and compile-time source generation. License:
Spark Sinatra inspired framework. License:
Apache Wink RESTFul web services based on JAX-RS specification. License:
Apache Olingo Apache Olingo is a Java and JavaScript library that implements the Open Data Protocol (OData). Open Data Protocol (OData) is an open protocol which allows the creation and consumption of queryable and interoperable RESTful APIs in a simple and standard way. License:
Rapidoid 1,634 about 2 years ago A simple, secure and extremely fast framework consisting of embedded HTTP server, GUI components and dependency injection. License: ,
Jmxtrans 1,705 about 2 years ago This is effectively the missing connector between speaking to a JVM via JMX on one end and whatever logging / monitoring / graphing package that you can dream up on the other end. License: ?,
Apache Camel 5,569 6 days ago Apache Camel is a powerful open source integration framework based on known Enterprise Integration Patterns with powerful Bean Integration. License: ,
Apache CXF Apache CXF is an open source services framework. CXF helps you build and develop services using frontend programming APIs, like JAX-WS and JAX-RS. These services can speak a variety of protocols such as SOAP, XML/HTTP, RESTful HTTP, or CORBA and work over a variety of transports such as HTTP, JMS or JBI. License:
Spring Integration 1,546 4 days ago Spring Integration provides an extension of the Spring programming model to support the well-known Enterprise Integration Patterns (EIP). License: ,
Sparklemotion Nokogiri 6,153 7 days ago Nokogiri is an HTML, XML, SAX, and Reader parser with XPath and CSS selector support. License: ,
Jsoup 10,949 17 days ago Scrapes, parses, manipulates and cleans HTML. . . License: ,
Webmagic 11,432 27 days ago A scalable web crawler framework. License: ,
Antlr4 17,216 12 days ago ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. License: ,
Parboiled 1,279 18 days ago Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful. License: ,
Pegdown 1,291 almost 8 years ago A pure-Java Markdown processor based on a parboiled PEG parser supporting a number of extensions. License: ,
Apache Nutch Highly extensible, highly scalable web crawler for production environment. License:
Crawler4j 4,555 about 3 years ago Simple and lightweight web crawler. License:
Alibaba Fastjson 25,750 4 months ago Fast JSON Processor , . and . License:
Gson 23,385 14 days ago Serializes objects to JSON and vice versa. Good performance with on-the-fly usage, . and . License:
LoganSquare 3,208 almost 3 years ago JSON parsing and serializing library based on Jackson's streaming API. Outpeforms GSON & Jackson's library, . and . License:
JSON java 4,535 8 days ago A reference implementation of a JSON package in Java, . and . License:
Square Moshi 9,783 9 days ago A modern JSON library for Android and Java , . and . License:
Instagram Ig json parser 1,316 about 2 years ago Fast JSON parser for java projects, . and . License:
Jackson Similar to GSON but has performance gains if you need to instantiate the library more often. Subprojects: Core part of Jackson, Core part of Jackson that defines Streaming API as well as basic shared abstractions, . and . License:
JSON.simple 747 8 months ago A simple Java toolkit for JSON. You can use json-simple to encode or decode JSON text, . and . License:
Genson 219 5 months ago -Powerful and easy to use Java to JSON conversion library, . and . License:
Jayway JsonPath 8,945 4 months ago Java JsonPath implementation, . and . License:
Alibaba Fastjson 25,750 4 months ago Fast JSON Processor , . and . License:
Jsonschema2pojo 6,239 20 days ago Generates Java types from JSON Schema (or example JSON) and annotates those types for data-binding with Jackson 1.x or 2.x, Gson, etc. , . and . License:
Json schema validator 1,626 4 months ago A JSON Schema validation implementation in pure Java, which aims for correctness and performance, in that order, also can generate Java types from JSON Schema or versa versa, . and . License: /
opencsv Simple CSV parser with a commercial-friendly license. License:
Super CSV Powerful CSV parser with support for Dozer, Joda-Time and Java 8. License:
uniVocity-parsers 916 3 months ago One of the fastest and most feature-complete CSV. Also comes with parsers for TSV and fixed width records. License:
Twitter Zipkin 17,014 about 1 month ago Zipkin is a distributed tracing system. It helps gather timing data needed to troubleshoot latency problems in microservice architectures. License: ,
Wizcorp Phonegap facebook plugin 1,913 almost 4 years ago The official plugin for Facebook in Apache Cordova/PhoneGap. License: ,
Twitter4j 2,778 3 months ago Twitter4J is an open-sourced, mavenized and Google App Engine safe Java library for the Twitter API. License: ,
Netflix Ice 2,856 about 2 years ago AWS (Amazon Web Services) Usage Tool. License: ,
Twitter Commons 2,099 almost 5 years ago Twitter common libraries for python and the JVM. License: ,
Alibaba RocketMQ RocketMQ is a fast, reliable, scalable, easy to use message oriented middleware breeding from alibaba massive messaging business. License: ,
Twitter Hbc 962 over 2 years ago A Java HTTP client for consuming Twitter's Streaming API. License: ,
Spring social 619 over 2 years ago Allows you to connect your applications with SaaS providers such as Facebook and Twitter. License: ,
XChange 3,874 about 1 month ago XChange is a Java library providing a streamlined API for interacting with 50+ Bitcoin and Altcoin exchanges providing a consistent interface for trading and accessing market data. License: ,
bitcoinj 4,985 12 days ago A library for working with Bitcoin. License: ,
DiabloMiner 538 about 1 year ago OpenCL miner for Bitcoin. License: ,
Netflix SimianArmy 7,979 almost 6 years ago Tools for keeping your cloud operating in top form. Chaos Monkey is a resiliency tool that helps applications tolerate random instance failures. License: ,
Netflix Eureka 12,432 21 days ago AWS Service registry for resilient mid-tier load balancing and failover.. License: ,
Aws sdk java 4,130 8 days ago Official mirror of the AWS (Amazon Web Services) SDK for Java. License: ,
Syncany 1,650 almost 4 years ago Syncany is a cloud storage and filesharing application with a focus on security and abstraction of storage. License: ,
Legacy Jclouds 466 over 6 years ago jclouds is an open source library that helps you get started in the cloud and reuse your java development skills. Our api allows you to freedom to use portable abstractions or cloud-specific features. We support many clouds including Amazon, VMWare, Azure, and Rackspace. License: ,
Elasticsearch 1,205 6 days ago Open Source, Distributed, RESTful Search Engine. License: ,
Elasticsearch cloud aws 577 about 2 years ago AWS Cloud Plugin for Elasticsearch. License: ,
Elasticsearch analysis ik 16,608 about 2 months ago The IK Analysis plugin integrates Lucene IK analyzer into elasticsearch, support customized dictionary. License: ?,
Apache CloudStack Apache CloudStack is an IaaS (“Infrastracture as a Service”) cloud orchestration platform. License:
Apache Stratos Apache Stratos is a highly-extensible Platform-as-a-Service (PaaS) framework that helps run Apache Tomcat, PHP, and MySQL applications and can be extended to support many more environments on all major cloud infrastructures. License:
Apache Airavata Apache Airavata is a software framework for executing and managing computational jobs and workflows on distributed computing resources including local clusters, supercomputers, national grids, academic and commercial clouds. Airavata is dominantly used to build Web-based science gateways and assist to compose, manage, execute, and monitor large scale applications (wrapped as Web based services) and workflows composed of these services. License:
Quarkus 13,820 3 days ago Quarkus is a Cloud Native, (Linux) Container First framework for writing Java applications
Apache Aurora Apache Aurora is a Mesos framework for long-running services and cron jobs. License:
Singularity Singularity is a Mesos framework that makes deployment and operations easy. It supports web services, background workers, scheduled jobs, and one-off tasks. License:
Apache Helix A cluster management framework for partitioned and replicated distributed resources. License:
Apache Airavata Apache Airavata is a software framework for executing and managing computational jobs and workflows on distributed computing resources including local clusters, supercomputers, national grids, academic and commercial clouds. Airavata is dominantly used to build Web-based science gateways and assist to compose, manage, execute, and monitor large scale applications (wrapped as Web based services) and workflows composed of these services. License:
Apache POI Supports OOXML (XLSX, DOCX, PPTX) as well as OLE2 (XLS, DOC or PPT). License:
documents4j API for document format conversion using third-party converters such as MS Word. License:
Docx4j Docx4j is an open source Java library for manipulating Microsoft OpenXML files (Word docx, Powerpoint pptx, and Excel xlsx) via JAXB. License:
jOpenDocument Processes the OpenDocument format. License: or proprietary. and
Apache Tika The Apache Tika toolkit detects and extracts metadata and structured text content from various documents using existing parser libraries. License:
Apache FOP Creates PDF from XSL-FO. License:
Apache PDFBox Toolbox for creating and manipulating PDF. License:
DynamicReports Simplifies JasperReports. License:
flyingsaucer 2,019 9 days ago XML/XHTML and CSS 2.1 renderer. License:
iText Creates PDF files programmatically but current versions require a license for commercial purposes. License: or proprietary. or . However, versions upto 4.2.0 were licensed under the business-friendly LGPL. From 2.1.7 the version jumped to the 4 series, one of the main changes was a renaming of the packages. These two versions are available in several repositories on github, see for example: and . The jars can be downloaded from . iText 2.1.7 and iText 4.2.0 are available under a . The book iText in Action 2nd Edition, from Manning, was written around the time of these LGPL versions. If you are making any contributions to iText please make them to these LGPL repositories on GitHub
JasperReports Complex reporting engine. License:
Java Native Access (JNA) 8,543 about 1 month ago Work with native libraries without writing JNI. Also provides interfaces to common system libraries. License: or . ,
JNR 1,257 30 days ago Work with native libraries without writing JNI. Also provides interfaces to common system libraries. Same goals as JNA, but faster, and serves as the basis for the upcoming . License:
Xalan Xalan-J is an XSLT processor written in Java. License:
Xerces Xerces-J is a validating XML parser written in Java. License:
XML Graphics Conversion from XML to graphical output. License:
Santuario Library implementing XML Digital Signature Specification & XML Encryption Specification. License:
VXQuery Apache VXQuery implements a parallel XML Query processor. License:
Apache Axis Web Service containers that helps users to create, deploy, and run Web Services. Axis2 is a Web Services / SOAP / WSDL engine, the successor to the widely used Apache Axis SOAP stack. License:
Apache SIS Library for developing geospatial applications. License:
Geo 410 8 days ago GeoHash utilities in Java. License:
Geotoolkit.org Library for developing geospatial applications. Built on top of the Apache SIS project. License:
GeoTools Library that provides tools for geospatial data. License:
H2GIS A spatial extension of the H2 database. License:
Jgeohash Library that can assist Java developers in using the GeoHash algorithm. License:
JTS Topology Suite An API of 2D spatial predicates and functions. License:
Mapsforge 1,196 7 days ago Software for the rendering of maps based on OpenStreetMap data. License:
Spatial4j 937 over 1 year ago General purpose spatial/geospatial ASL licensed open-source Java library. License:
Membrane Service Proxy 463 7 days ago An open source, reverse HTTP proxy framework written in Java. License: ,
ArchUnit 3,236 7 days ago is a free, simple and extensible library for checking the architecture of your Java code. License: ,
Junit 8,528 3 months ago Common testing framework. License:   ,
Mockito 14,885 6 days ago Creation of test double objects in automated unit tests for the purpose of TDD or BDD. License: ,
Selenium 30,751 6 days ago Portable software testing framework for web applications. License: ,
Cucumber jvm 2,703 6 days ago BDD testing framework. Cucumber-JVM is a pure Java implementation of Cucumber that supports the most popular programming languages for the JVM. . License: ,
JBehave 31 14 days ago extensively configurable framework for Behavior-Driven Development (BDD). BDD is an evolution of test-driven development (TDD) and acceptance-test driven design, and is intended to make these practices more accessible and intuitive to newcomers and experts alike. License: ,
Spock 3,552 7 days ago JUnit-compatible framework featuring an expressive Groovy-derived specification language. License: ,
Google Firing range 1,379 about 4 years ago Firing Range is a test bed for web application security scanners, providing synthetic, wide coverage for an array of vulnerabilities. It can be deployed as a Google App Engine application. License: ,
Fitnesse 2,045 3 days ago FitNesse is the fully integrated stand-alone acceptance testing framework and wiki.. License: ,
Sikuli 1,705 about 5 years ago Sikuli is a visual technology to automate graphical user interfaces (GUI) using images (screenshots). The current release of Sikuli includes Sikuli Script, a visual scripting API for Jython, and Sikuli IDE, an integrated development environment for writing visual scripts with screenshots easily. License: ,
JavaHamcrest 2,113 4 days ago Matchers that can be combined to create flexible expressions of intent. License: ,
Wiremock 6,374 3 days ago Stubbs and mocks web services. License: ,
TestNG 1,991 9 days ago Testing framework. License: ,
Galenframework Galen 1,412 over 2 years ago Layout and functional testing framework for websites. License: ,
AssertJ 2,633 5 days ago Fluent assertions that improve readability. License: ,
Google truth 2,732 6 days ago Google's assertion and proposition framework. License: ,
Apache JMeter Functional testing and performance measurements. License:
Arquillian Integration and functional testing platform for Java EE containers. License:
Awaitility 3,828 4 months ago DSL for synchronizing asynchronous operations. License:
Citrus Integration testing framework with focus on client- and serverside messaging. License:
Gatling Load testing tool designed for ease of use, maintainability and high performance. License:
GreenMail In-memory email server for integration testing. Supports SMTP, POP3 and IMAP including SSL. License:
JGiven Developer-friendly BDD testing framework compatible with JUnit and TestNG. License:
JMockit Mocks static, final methods and more. License:
JUnitParams Creation of readable and maintainable parametrised tests. License:
Moco 4,374 4 months ago Concise web services for stubs and mocks, Duke's Choice Award 2013. License:
PIT Fast mutation-testing framework for evaluating fault-detection abilities of existing JUnit or TestNG test-suites. License:
PowerMock 4,162 11 months ago Enables mocking of static methods, constructors, final classes and methods, private methods and removal of static initializers. License:
REST Assured 6,857 3 months ago Java DSL for easy testing for REST/HTTP services. License:
Selenide -Concise API around Selenium to write stable and readable UI tests. License:
Unitils Modular testing library for unit and integration testing. License:
SeLion 281 12 months ago Enabling Test Automation in Java. SeLion builds on top of TestNG and Selenium to provide a set of capabilities that get you up and running with WebDriver in a short time. It can be used for testing web and mobile applications, . License:
cdp4j Web-automation library for Java. It can be used for automating the use of web pages and for testing web pages. License:
Image-Comparison 343 5 months ago Published on Maven Central Java Library that compares 2 images with the same sizes and shows the differences visually by drawing rectangles. Some parts of the image can be excluded from the comparison. License:
LogCaptor 374 17 days ago Captures log entries for unit testing purposes. License: ,
JaCoCo Framework that enables collection of code coverage metrics, using both offline and runtime bytecode instrumentation; prominently used by EclEmma, the Eclipse code-coverage plugin. License: , ,
Clover Proprietary code coverage tool by Atlassian that relies on source-code instrumentation, instead of bytecode instrumentation
Cobertura Relies on offline (or static) bytecode instrumentation and class loading to collect code coverage metrics. License:
JCov Code coverage tool used in the OpenJDK project's development toolchain. License:
Bamboo Atlassian's solution with good integration of their other products. You can either apply for an open-source license or buy it
CircleCI Hosted service with a free trial
Codeship Hosted services with a limited free plan
fabric8 Integration platform for containers. License:
Go ThoughtWork's open-source solution. License:
Jenkins Provides server-based deployment services. License:
TeamCity JetBrain's CI solution with a free version
Travis Hosted service often used for open-source projects. License: ?
Hudson Hudson monitors the execution of repeated jobs, such as building a software project or jobs run by cron. Currently Hudson focuses on the following two jobs: Building/testing software projects continuously and Monitoring executions of externally-run jobs. License:
Apache Continuum Apache Continuum software is an enterprise-ready continuous integration server with features such as automated builds, release management, role-based security, and integration with popular build tools and source control management systems.. License:
CATG 102 almost 7 years ago Concolic unit testing engine. Automatically generates unit tests using formal methods. License: , License:
Checker Framework Pluggable type systems. Includes nullness types, physical units, immutability types and more. License:
Daikon Daikon detects likely program invariants and can generate JML specs based on those invariats. License:
Java Modeling Language (JML) Behavioral interface specification language that can be used to specify the behavior of code modules. It combines the design by contract approach of Eiffel and the model-based specification approach of the Larch family of interface specification languages, with some elements of the refinement calculus. Used by several other verification tools. License:
Java Path Finder (JPF) JVM formal verification tool containing a model checker and more. Created by NASA. License:
jCUTE 88 over 10 years ago Concolic unit testing engine that automatically generates unit tests. Concolic execution combines randomized concrete execution with symbolic execution and automatic constraint solving
JMLOK 2.0 Detects nonconformances between code and JML specification through the feedback-directed random tests generation, and suggests a likely cause for each nonconformance detected. License:
KeY The KeY System is a formal software development tool that aims to integrate design, implementation, formal specification, and formal verification of object-oriented software as seamlessly as possible. Uses JML for specification and symbolic execution for verification. License:
OpenJML Translates JML specifications into SMT-LIB format and passes the proof problems implied by the program to backend solvers. License: and
JetBrains Intellij Сommunity 17,383 4 days ago Supports a lot of JVM languages and provides good options for Android development. The commercial edition targets the enterprise sector. License: ,
JetBrains Ideavim 9,305 4 days ago Vim emulation plug-in for IDEs based on the IntelliJ platform. License: ,
Rstudio 4,692 3 days ago RStudio is an integrated development environment (IDE) for R. License: ,
Vrapper 1,113 3 months ago Vim-like editing in Eclipse. License: .0,
Eclipse themes 828 8 months ago Jeeeyul's Eclipse Themes allows you to customize every single details of Eclipse's appearance. License: ,
Eclipse color theme 901 almost 2 years ago Color themes for Eclipse. License: ,
Eclim 1,041 4 months ago Expose eclipse features inside of vim. License: ,
JetBrains MPS 1,552 4 days ago JetBrains Meta programming System. Design your own Domain Specific Language with full development environment. Get code editor with completion, semantics and type checking with one click. Write generators to compile your DSL into multiple target languages, such as Java, C, XML, and many more. License: ,
Idea markdown 600 over 8 years ago Markdown language support for IntelliJ IDEA. License: ,
Eclipse Established, open-souce project with support for lots of plugins and languages. License:
NetBeans Provides integration for several Java SE and EE features from database access to HTML5. License: and
Apache Maven 4,362 6 days ago Declarative build and dependency management which favors convention over configuration. It might be preferable to Apache Ant which uses a rather procedural approach and can be difficult to maintain. License: ,
Google Bazel 23,233 6 days ago Build tool from Google that builds code quickly and reliably. License: ,
Gradle 16,949 4 days ago Incremental builds which are programmed via Groovy instead of declaring XML. Works well with Maven's dependency management. License: ,
Apache Ant pache Ant is a Java library and command-line tool whose mission is to drive processes described in build files as targets and extension points dependent upon each other. Subproject: - testing Ant task, - support additional archive formats, - very powerful dependency manager, - IvyDE plugin for Eclipse. License:
Facebook Buck 8,562 about 1 year ago A fast build system that encourages the creation of small, reusable modules over a variety of platforms and languages. License: ,
Archiva Apache The Build Artifact Repository Manager. Apache Archiva™ is an extensible repository management software that helps taking care of your own personal or enterprise-wide build artifact repository. It is the perfect companion for build tools such as Maven, Continuum, and ANT. License:
config 6,170 3 months ago Configuration library for JVM languages. License: ,
owner 917 19 days ago Reduces boilerplate of properties. License:
Netflix Archaius 2,473 9 days ago Library for configuration management API. Archaius includes a set of configuration management APIs used by Netflix. License: ,
LightAdmin Pluggable data administration UI library for Java web applications. License:
Apache Yetus A collection of libraries and tools that enable contribution and release processes for software projects. License:
Bintray Version control for binaries which handles the publishing. Can also be used with Maven or Gradle and has a free plan for open-source software or several business plans
Capsule 1,150 over 2 years ago Simple and powerful packaging and deployment. A fat JAR on steroids or a "Docker for Java" that supports JVM-optimized containers. . License:
Central Repository Largest binary component repository available as a free service to the open-source community. Default used by Apache Maven and available in all other build tools
IzPack 327 10 days ago Setup authoring tool for cross-platform deployments. License: , )
JitPack 2,535 22 days ago Easy to use package repository for GitHub. Builds Maven/Gradle projects on demand and publishes ready-to-use packages. License: , )
Launch4j Wraps JARs in lightweight and native Windows executables. License: or
Nexus Binary management with proxy and caching capabilities
packr 2,566 7 months ago Packs JARs, assets and the JVM for native distribution on Windows, Linux and Mac OS X. License:
Spotify Helios 2,111 2 months ago Docker container orchestration platform. License: ,
Square Leakcanary 29,420 3 months ago A memory leak detection library for Android and Java. License: ,
Dropwizard Metrics 7,844 10 days ago Capturing JVM- and application-level metrics. License: ,
GCViewer 4,467 over 1 year ago Fork of tagtraum industries' GCViewer. Tagtraum stopped development in 2008, I aim to improve support for Sun's / Oracle's java 1.6+ garbage collector logs (including G1 collector). License: ,
AdoptOpenJDK Jitwatch 3,094 about 1 month ago Log analyser / visualiser for Java HotSpot JIT compiler. Inspect inlining decisions, hot methods, bytecode, and assembly. View results in the JavaFX user interface. License: ,
Naver Pinpoint 13,422 6 days ago Pinpoint is an open source APM (Application Performance Management) tool for large-scale distributed systems written in Java. License: ,
jHiccup 685 6 months ago Logs and records platform JVM stalls. License:
JMH Microbenchmarking tool for the JVM. License:
LatencyUtils 454 7 months ago Utilities for latency measurement and reporting. License:
VisualVM Visual interface for detailed information about running applications. License:
YourKit Java Profiler Commercial profiler
JProfiler Commercial profiler
XRebel A commercial profiler for Java Web applications
SonarQube 9,100 6 days ago Integrates other analysis components via plugins and provides an overview of the metrics over time. License: ,
Google Error prone 6,857 6 days ago Catches common programming mistakes as compile-time errors. License: ,
OpenGrok 4,366 23 days ago OpenGrok is a fast and usable source code search and cross reference engine, written in Java. It helps you search, cross-reference and navigate your source tree. It can understand various program file formats and version control histories like Mercurial, Git, SCCS, RCS, CVS, Subversion, Teamware, ClearCase, Perforce, Monotone and Bazaar. License: , )
Checkstyle 8,350 6 days ago Static analysis of coding conventions and standards. License:
FindBugs Static analysis of bytecode to find potential bugs. License:
jQAssistant Static code analysis with Neo4J-based query language. License:
PMD 4,883 6 days ago Source code analysis for finding bad coding practices. License:
AppDynamics Commercial performance monitor
JavaMelody 2,963 11 days ago Performance monitoring and profiling. License:
jmxtrans 1,705 about 2 years ago Tool to connect to multiple JVMs and to query them for their attributes via JMX. Its query language is based on JSON, which allows non-Java programmers to access the JVMs attributes. Likewise, this tool supports different output writes, including Graphite, Ganglia, StatsD, among others. License:
Kamon Tool for monitoring applications running on the JVM. License:
Glowroot Open source Java APM. License:
New Relic Commercial performance monitor
SPM Commercial performance monitor with distributing transaction tracing for JVM apps
OverOps Root cause automation in production
Dynamic Code Evolution Virtual Machine (DCE VM) The Dynamic Code Evolution Virtual Machine (DCE VM) is a modification of the Java HotSpot(TM) VM that allows unlimited redefinition of loaded classes at runtime. License:
DCEVM This project is a fork of original DCEVM project. The purpose of the project is to maintain enhanced class redefinition functionality for OpenJDK HotSpot 7/8 and Oracle JVM. License:
HotswapAgent 2,359 8 days ago Java unlimited redefinition of classes at runtime. License:
JRebel Reload code changes instantly. Skip the build and redeploy process. JRebel reloads changes to Java classes, resources, and over 90 frameworks
Spring Loaded 2,721 over 2 years ago Java agent that enables class reloading in a running JVM. License:
Markdown-doclet: 319 about 4 years ago A Doclet that allows the use of Markdown ( ) and in JavaDoc comments. License: ,
Google J2ObjC: 5,995 6 days ago A Java to iOS Objective-C translation tool and runtime. License: ,
Bytecode viewer 14,699 about 1 month ago A Java 8 Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More). License: ,
Reflections 4,728 5 months ago Java runtime metadata analysis, in the spirit of Scannotations. Reflections scans your classpath, indexes the metadata, allows you to query it on runtime and may save and collect that information for many modules within your project. License: ,
Jabba: 3,007 8 months ago Java Version Manager inspired by (Node.js). The goal is to provide unified pain-free experience of installing (and switching between different versions of) JDK. License ,
Chocotea: Generates postman collection, environment and integration tests from java code. License ,
JDK 9 Early access releases of JDK 9. License:
OpenJDK Open-source implementation for Linux. License:
Zulu OpenJDK OpenJDK builds for Windows, Linux, and Mac OS X through Java 8. License:
Zulu OpenJDK 9 Early access OpenJDK 9 builds for Windows, Linux, and Mac OS X. License:
Clojure 10,478 7 days ago The Clojure programming language. License: ,
JetBrains Kotlin 49,396 3 days ago The Kotlin Programming Language. License: ,
Gocd 7,119 4 days ago Main repository for Go Continuous Delivery. License: ,
Groovy core 5,209 7 days ago The Groovy programming language. License: ,
Jphp compiler Jphp 1,712 almost 3 years ago An alternative to Zend PHP, like JRuby and Jython only for PHP. License: ,
Trifork Erjang 727 over 6 years ago A JVM-based Erlang VM. License: ,
Go lang idea plugin 4,561 over 6 years ago Google Go language IDE built using the IntelliJ Platform. License: ,
Processing js 1,695 almost 6 years ago A port of the Processing visualization language to JavaScript. License: ,
Pysonar2 1,391 about 2 months ago PySonar2 is a type inferencer and indexer for Python, which performs sophisticated interprocedural analysis to infer types. License: ,
Yuicompressor 3,014 about 3 years ago The YUI Compressor is a JavaScript compressor which, in addition to removing comments and white-spaces, obfuscates local variables using the smallest possible variable name. License: ,
Google Closure compiler 7,407 6 days ago A JavaScript checker and optimizer. License: ,
Frontend maven plugin 4,260 7 days ago "Maven-node-grunt-gulp-npm-node-plugin to end all maven-node-grunt-gulp-npm-plugins." A Maven plugin that downloads/installs Node and NPM locally, runs NPM install, Grunt, Gulp and/or Karma. License: ,
Dynjs 613 over 3 years ago ECMAScript runtime for the JVM. License: ,
ANTLR Complex full-featured framework for top-down parsing. License:
JavaCC -More specific and slightly easier to learn. Has syntactic lookahead. License:
Square Keywhiz 2,621 about 1 year ago A system for distributing and managing secrets. License: ,
Rundeck 5,555 3 days ago Job scheduler and runbook automation. Enable self-service access to existing scripts and tools. License: ,
KeyBox 3,191 6 months ago KeyBox is a web-based SSH console that centrally manages administrative access to systems. Web-based administration is combined with management and distribution of user's public SSH keys. License: ,
OpenTripPlanner 2,217 4 days ago An open source multi-modal trip planner. License: ,
Netflix Servo 1,417 12 months ago Netflix Application Monitoring Library. License: ,
Jitsi 4,155 24 days ago Jitsi is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, AIM/ICQ, IRC, Yahoo! and many other useful features. License: ,
Netflix Exhibitor 1,677 about 5 years ago ZooKeeper co-process for instance monitoring, backup/recovery, cleanup and visualization. License: ,
Glyptodon Guacamole client 1,078 over 1 year ago The HTML5/JavaScript Guacamole client, its containing web application, and related components. License: ,
Bateman 726 over 10 years ago Simple stock trading system that optimizes its parameters with particle swarm optimization. License: ,
Java repl 1,336 over 6 years ago Java REPL is a simple Read-Eval-Print-Loop for Java language. License: ,
Seyren 859 almost 2 years ago An alerting dashboard for Graphite. License: ,
Graphhopper 5,411 6 days ago Open source routing library and server using OpenStreetMap. License: ,
Ttorrent 1,388 about 1 month ago Turn's BitTorrent Java library (tracker and client). License: ,
Geoserver 3,865 4 days ago Official GeoServer repository. License: .0,
Languagetool 12,431 4 days ago Style and Grammar Checker for 25+ Languages. License: ,
Apache OpenMeetings Video conferencing, instant messaging, white board and collaborative document editing application. License:
Bukkit 2,401 11 months ago The Minecraft Mod API. License: ,
MovingBlocks Terasology 3,683 25 days ago Terasology - open source voxel world. The Terasology project was born from a Minecraft-inspired tech demo and is becoming a stable platform for various types of gameplay settings in a voxel world. License: ,
MinecraftForge 6,939 6 days ago Modifications to the Minecraft base files to assist in compatibility between mods. License: ,
SpongePowered Sponge 1,137 9 months ago A Forge mod that implements SpongeAPI. License: ,
BuildCraft 1,329 4 months ago BuildCraft — mod for Minecraft. License: ,
Equivalent Exchange 3 691 almost 7 years ago pahimar Equivalent-Exchange-3. Mods for Minecraft. License: ,
SpongePowered SpongeAPI 1,139 7 days ago A Minecraft plugin API. License: ,
WorldEdit 3,120 12 days ago An in-game voxel map editor for Minecraft. License: ,
Essentials 880 almost 2 years ago Essentials - Minecraft server command mod - Adds over 100 commands for use in-game to help manage a server. License: ,
GlowstoneMC Glowstone 1,899 about 1 year ago An open-source server for the Bukkit Minecraft modding interface. License: ,
Tribal Trouble 175 over 2 years ago Tribal Trouble is a realtime strategy game released by Oddlabs in 2004. In 2014 the source was released under GPL2 license. License: ,
Java design patterns 90,038 3 days ago Design patterns implemented in Java. License:   ,
Spring projects Spring mvc showcase 4,980 almost 3 years ago Demonstrates the capabilities of the Spring MVC web framework through small, simple examples. License: ,
Javaee7 samples 2,509 about 2 years ago Java EE 7 Samples. License: /CDDL/GPLv2,
Algorithms 2,788 6 months ago Solutions for some common algorithm problems written in Java. License: ,
WikiSort 1,268 almost 3 years ago Fast and stable sort algorithm that uses O(1) memory. License: ,
Spring petclinic 7,773 10 days ago A sample Spring-based application. License: ,
Spring integration samples 2,324 about 2 months ago You are looking for examples, code snippets, sample applications for Spring Integration? This is the place. License: ,
Java algorithms implementation 4,454 almost 2 years ago Algorithms and Data Structures implemented in Java. License: ,
Jboss developer Jboss eap quickstarts 821 10 days ago The quickstarts demonstrate JBoss EAP, Java EE 7 and a few additional technologies. They provide small, specific, working examples that can be used as a reference for your own project. License: ,
Databricks Learning spark 3,890 11 months ago Example code from Learning Spark book. License: ,
7guis 908 about 1 year ago 7GUIs is a GUI programming usability benchmark. License: ?,
Spring projects Spring data jpa examples 5,203 24 days ago Spring Data Example Projects. License: ,
Modern Java - A Guide to Java 8 16,720 over 1 year ago Modern Java - A Guide to Java 8. License:
Java Micro code pieces community library of micro Java code solutions for popular issues
Jvm serializers 3,290 about 1 year ago Benchmark comparing serialization libraries on the JVM. License: ?,
YCSB (Yahoo! Cloud Serving Benchmark) 4,955 7 days ago Yahoo! Cloud Serving Benchmark. License: ,
Gitblit 2,278 6 months ago Gitblit is an open source, pure Java Git solution for managing, viewing, and serving Git repositories. It can serve repositories over the GIT, HTTP, and SSH transports; it can authenticate against multiple providers; and it allows you to get up-and-running with an attractive, capable Git server in less than 5 minutes.. License: ,
WhisperSystems BitHub 998 almost 5 years ago BTC + BitHub = An experiment in funding privacy OSS. BitHub is a service that will automatically pay a percentage of Bitcoin funds for every submission to a GitHub repository. License: ?,
r/java Subreddit for the Java community
stackoverflow Question/answer platform
vJUG Virtual Java User Group
DevProjects Community to discuss Java projects and share solutions
Effective Java (3nd Edition)
Modern Java in Action
Java Concurrency in Practice
Thinking in Java
Android Arsenal
Google Java Style
Hackr.io
InfoQ
Java, SQL, and jOOQ
Javalobby
Java tutorial
JavaWorld
JAXenter
RebelLabs
The Java Specialist' Newsletter
The Takipi Blog
TheServerSide.com
Thoughts On Java
Vanilla Java
Vlad Mihalcea on Hibernate
Voxxed
OverOps Blog
Bookmarks.dev
Baeldung
InterviewBit

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