awesome-android

Charting Engine

EazeGraph

Chart and graph library

WilliamChart

Chart library with good motion capabilities

HelloCharts

Chart and graph library with support for scaling, scrolling and animations

MPAndroidChart

An Android chart and graph library supporting scaling and dragging by gesture

RoboGuice

Dependency injection framework for Android

Dagger

Dependency injection framework for Java and Android

View "injection" library for Android

AndroidAnnotations

Java annotations with dependency injection at compile time

Free, Fun and Fast Android 2D OpenGL Game Engine

Augmented Reality library

Cross-platform game creation system

Rajawali

Android OpenGL ES 2.0/3.0 Engine

A swipe refresh layout is available in the v4 support library

Cardslib

Android Library to build a UI Card

AndroidStaggeredGrid

Grid view which supports multiple columns with rows of varying sizes

Android-Query (AQuery) is a light-weight library for doing asynchronous tasks and manipulating UI elements in Android

Flow

Library that helps with describing an app as a collection of moderately independent screens

Crouton

Context sensitive notifications for Android

DragSortListView

Extension of the Android ListView that enables drag-and-drop reordering (No longer maintained)

MaterialProgressBar

Material design ProgressBar with consistent appearance

ActionBar for older Android versions

FadingActionBar

Fading action bar effect that can be seen in the new Play Music app

SlidingMenu

Library to create applications with slide-in menus

PagerSlidingTabStrip

An interactive indicator to navigate between the different pages of a ViewPager

Page View indicator

Support for horizontally scrolling ViewPager

MaterialDrawer

Simple take on a material design navigation drawer

NineOldAndroids

Library for using the Honeycomb animation API on all versions of the platform back to 1.0

Rebound

Rebound is a java library that models spring dynamics

Android View Animations

Cute view animation collection

android-crop

Library project for cropping images

CircularImageView

Custom view for circular images while maintaining the best draw performance

FloatingLabel

FloatingLabel Allows you to create a blow kind of EditText

MaterialEditText

Supporting Floating Labels, Single Line Ellipsis, Max/Min Characters, Helper Text and Error Text with Custom Colors

Emojicon

Adds emoticons to your app

Picasso

A powerful image downloading and caching library for Android

Universal Image Loader

Asynchronous, out of the box loading and caching of images

Glide

An image loading and caching library for Android focused on smooth scrolling,Recommended by google

Fresco

An Android library for managing images and the memory they use

Gson is a Java library used for serializing and deserializing Java objects from and into JSON

High-performance JSON processor

Easy crash reporting solution

Distribution, Crash Reports, Feedback and Analytics

Monitoring, Crash Reports, Real tima data, Statistic

Cross platform error monitoring

Ion

Good networking library for android

OkHttp

An HTTP+SPDY client for Android and Java applications

Asynchronous Http Client

An Asynchronous HTTP Library

RoboSpice

Library that makes writing asynchronous network requests easy

IceNet

Fast, Simple and Easy Networking for Android

Official Android HTTP library that makes networking for easier and faster

IceSoap

Easy, asynchronous, annotation-based SOAP for Android

node-android

Run Node.js on Android

Access the sqlite easily via direct database access or through the ContentProvider framework

DbInspector

Provides a simple way to view the contents of the in-app database for debugging purposes

Realm

The alternative to SQLite and ORMs: Simple, modern and fast! Object oriented API and multi platform support

RestorableSQLiteDatabase

A wrapper to replicate android's SQLiteDatabase with restoring capability

Light & fast ORM solution

Lightweight ORM Java package for JDBC and Android

Active record style ORM

Insanely easy way to work with Android Databases

Retrofit turns your REST API into a Java interface

Test automation framework for black-box UI tests

Unit test framework to run tests inside the JVM on your workstation, not in the emulator

AssertJ Android

AssertJ assertions geared towards Android

Tracking your marketing campaigns across multiple ad networks

Analytics platform to analyze the users

EventBus is a library that simplifies communication between different parts of your application

Otto

Event Bus for Android

Weak handler

Memory safer implementation of android.os.Handler

SmartGattLib

Simplifies the work with Bluetooth SMART devices (a.k.a. Bluetooth Low Energy in Bluetooth 4.0)

The Android Support Library package is a set of code libraries that provide backward-compatible versions of Android framework API

Library to access Google services, such as account syncing, Google+ (sharing, single sign-on), Google Maps, Location APIs, Google Play Games, Cloud Messaging, Android Device Manager, and others

Tape

A lightning fast, transactional, file-based FIFO for Android and Java

Android Annotation framework

Using Java annotations, developers can show their intent and let AndroidAnnotations generate the plumbing code at compile time

Guava: Google Core Libraries for Java

Collections, caching, primitives support, concurrency libraries, common annotations, string processing, I/O, and so forth

Allows to run scripting languages on Android

Android Priority Job Queue

Implementation of a Job Queue to easily schedule jobs (tasks) that run in the background, improving UX and application stability

RateMeMaybe

Asks the user if (s)he wants to open the Play Store to rate your application

Easy Rating Dialog

Lib provides a simple way to display an alert dialog for rating app

ZXing Android-Integration

Integration with Barcode Scanner via Intent

Gradle Retrolambda Plugin

Java 8 Lambdas on Android!

Very good tutorials by Lars Vogel

[Android Design in Action Video series] ( ) The video series by Android Design Team of Google

[Android Design in Action slides] ( The application that gives you access to the slides of the video series

[Android DevBytes Video Series] ( ) - It is the technical counterpart of Android Design in Action series

A series of articles from Googler and others, answering most commonly asked question: "What are some of the important rules to keep in mind when developing Android applications?"

Very good tutorials for beginners

Newsletter with weekly information about android

Generator for icons and other assets

Wraps app screenshots in real device artwork

[Android UI design resources] ( ) - Gives you wide variety of design resources form a Google Developer Expert in UI/UX

[Pencil Project] ( ) - An open source prototyping software

Google Wear App

This is an open source Google Wear App that uses speech recognition to calculate a tip

Video tutorials by Derek Banas

android-blogs

List with blogs about Android

Large list of android libraries

App that demonstrates different libraries

Multiple high quality libraries by square

Yet another list of android libraries

Framework to create native iOS, Android, Mac and Windows apps in C#

Open source framework by Adobe to create cross platform mobile apps using HTML, CSS, and JavaScript

Open-source framework to create 'native' cross platform apps using JavaScript

An open-source framework to build native iOS and Android apps with JavaScript from a single code base

React Native

A framework for building native apps with React by Facebook

A framework to build hybrid apps with mobile-optimized HTML, CSS and JS with AngularJS

Apache Cordova

Cordova based applications are, at the core, applications written with web technology: HTML, CSS and JavaScript

Cordova based framework to build hybrid apps with mobile-optimized HTML, CSS and JS with ReactJS

Framework to create native iOS and Android Apps (especially Games)

Introduction to Scala on Android

Scaloid

Library for less painful Android development with Scala

Macroid

A modular functional UI language for Android

Introduction to Groovy on Android

Groovy Language Support for Android

Gradle Plugin for Compiling Groovy for Android

SwissKnife

A multi-purpose Groovy library containing view injection and threading for Android using annotations

Anko

DSL for Android written in Kotlin by JetBrains

Kotterknife

Android view injection writen in Kotlin based on ButterKnife

Android Kotlin Samples

Some basic Android code samples writen in Kotlin