awesome-crystal

Toolbox

A curated list of useful and stable Crystal libraries and tools for software development

gem A collection of awesome Crystal libraries, tools, frameworks and software

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Language: Crystal
last commit: over 1 year ago
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Awesome Crystal / Algorithms and Data structures
bisect 12 over 4 years ago Inserting values into a sorted array
blurhash.cr 23 over 1 year ago implementation
crie 12 over 4 years ago Compile-time Trie
CrOTP 63 about 2 years ago HOTP and TOTP implementation for two factor authentication
crystal-linked-list 13 over 5 years ago Implementation of Linked List
crystaledge 26 over 2 years ago A pure Vector Math library
crystalg 38 over 4 years ago A Generic Algorithm Library
crystalline 127 about 2 years ago A collection of containers and algorithms
csuuid 15 about 1 year ago A Chronologically Sortable UUID
edits.cr 16 over 1 year ago Collection of edit distance algorithms
fzy 47 12 months ago A Crystal port of awesome Fzy project fuzzy finder algorithm
Goban 26 about 1 year ago A fast and efficient QR Code implementation
graphlb 20 over 4 years ago Collection of graph datastructure and algorithms
haversine 16 over 1 year ago An Implementation of the Haversine formula
HKDF 1 about 2 years ago HMAC-based Extract-and-Expand Key Derivation Function
kd_tree 16 over 1 year ago An implementation of "K-Dimensional Tree" and "N-Nearest Neighbors"
ksuid.cr 15 about 2 years ago K-Sortable Globally Unique IDs
markov 21 over 4 years ago Build Markov Chains and run Markov Processes
multiset.cr 4 almost 3 years ago Implementation of a multiset
named_information 0 almost 2 years ago Naming Things with Hashes
qr-code 18 almost 2 years ago QR Code generator
radix 102 over 1 year ago Radix Tree implementation
s2_cells 0 over 1 year ago for spatial indexing
secure-remote-password 7 over 3 years ago SRP-6a protocol for authentication over an insecure network
SPAKE2+ 2 about 2 years ago Password Authenticated Key Exchange (PAKE) protocol, comparable to SRP-6a
splay_tree_map 15 about 1 year ago Splay Tree implementation that conforms to the Hash ducktype
verhoeff 0 about 2 years ago Implementation of the Verhoeff checksum algorithm

Awesome Crystal / Blockchain
Axentro 192 over 4 years ago A custom blockchain platform
Cocol 19 over 5 years ago A minimal blockchain testbed
secp256k1.cr 48 over 2 years ago Elliptic curve used in the public-private-key cryptography

Awesome Crystal / C bindings
augeas.cr 7 about 4 years ago Bindings for
clang.cr 47 over 1 year ago Libclang bindings
crt.cr 27 over 4 years ago Bindings for libncursesw and crt
crystal-gsl 3 over 1 year ago Bindings for
crystal-hunspell 7 over 1 year ago Bindings for
duktape.cr 137 over 2 years ago Bindings for the javascript engine
fftw.cr 12 over 3 years ago Bindings for library
gphoto2.cr 16 12 months ago Bindings for the library
gpio.cr 2 over 1 year ago Bindings for the gpiod library (general purpose IO control and feedback)
icu.cr 11 over 1 year ago Bindings for the library
libnotify.cr 26 about 4 years ago Bindings for Libnotify
nlopt.cr 3 over 3 years ago Bindings for
pcap.cr 25 over 5 years ago Bindings for libpcap
pledge.cr 8 over 4 years ago Bindings for OpenBSD's
ssh2.cr 44 12 months ago Bindings for libssh2 library
syslog.cr 10 over 4 years ago Bindings for
v4l2.cr 5 over 1 year ago Bindings for
wasmer-crystal 93 about 1 year ago Bindings for the WebAssembly runtime
win32cr 17 about 1 year ago Bindings for Win32 API
x_do.cr 18 over 2 years ago Bindings for libxdo ( )

Awesome Crystal / Caching
crystal-memcached 36 about 2 years ago Implementation of a memcached client

Awesome Crystal / CLI Builders
admiral 138 over 4 years ago A robust DSL for writing command line interfaces
Athena Console 17 11 months ago Allows for the creation of CLI based commands
clicr 30 about 5 years ago A simple declarative command line interface builder
clim 123 over 4 years ago Slim command line interface builder
Cling 26 about 1 year ago A modular, non-macro-based command line interface library
commander 128 over 4 years ago Command-line interface builder
Keimeno 14 over 5 years ago A lightweight text user interface library in Crystal
OptionParser command-line options processing (Crystal stdlib)
Phreak 33 over 4 years ago A highly flexible Crystal CLI builder in the style of OptionParser

Awesome Crystal / CLI Utils
climate 14 about 2 years ago Tiny tool to make your CLI output 🌈 coloured
coin 6 almost 4 years ago Command-line application that performs currency conversion via the
cride 50 over 4 years ago A light CLI text editor/IDE
git-repository 2 about 1 year ago A git cli wrapper querying and cloning remote repositories with minimal data transfer
hetzner-k3s 1,954 11 months ago A CLI tool to quickly create and manage Kubernetes clusters in Hetzner Cloud
lff 18 over 4 years ago Simple and straightforward large files finder utility in command line
meet 38 over 2 years ago Start a jitsi meeting quickly from the comfort of your command line
oq 191 over 1 year ago A performant, and portable jq wrapper to facilitate the consumption and output of formats other than JSON; using filters to transform the data
progress_bar.cr 15 over 1 year ago A simple and customizable progress bar
tablo 28 about 1 year ago A flexible terminal table generator
tallboy 57 over 4 years ago Generate ASCII character tables with support for spanning cells over multiple columns

Awesome Crystal / Code Analysis and Metrics
ameba 525 11 months ago A static code analysis tool
linguist.cr 8 over 5 years ago Using multiple ways to find programming language used in files, based on Github's Linguist

Awesome Crystal / Compression
Crystar 38 over 1 year ago Readers and writers of Tar archive format
Gzip readers and writers of gzip format (Crystal stdlib)
polylines.cr 10 over 4 years ago — compression of series of coordinates
snappy 18 over 4 years ago Snappy compression format reader/writer for Crystal
Zip readers and writers of zip format (Crystal stdlib)
Zlib readers and writers of zlib format (Crystal stdlib)
zstd.cr 41 over 1 year ago Bindings for compression library

Awesome Crystal / Configuration
cr-dotenv 96 over 4 years ago Loads .env file
Envy 8 over 1 year ago Load environment variables from YAML
envyable 6 over 4 years ago A simple YAML to ENV config loader
habitat 84 over 1 year ago Type safe configuration for your classes and modules
totem 68 over 1 year ago Load and parse a configuration in JSON, YAML, dotenv formats

Awesome Crystal / Converters
base62.cr 10 about 2 years ago Base62 encoder/decoder, well suited for url-shortening
crunits 6 almost 3 years ago Tool for converting units of measure (miles to kilometers, celsius to fahrenheit etc)
money 32 about 2 years ago Handling money and currency conversion with ease (almost complete port of )
sass.cr 35 over 4 years ago Compile SASS/SCSS to CSS ( binding)

Awesome Crystal / Cryptography
cmac 5 about 1 year ago Crystal implementation of Cipher-based Message Authentication Code (CMAC)
ed25519 8 about 3 years ago the Ed25519 elliptic curve public-key signature system described in [RFC 8032]
monocypher.cr 17 over 2 years ago Crystal wrapper for the Monocypher crypto library
sodium.cr 50 over 3 years ago Crystal wrapper for the libsodium crypto API

Awesome Crystal / Data Formats
BinData 48 over 1 year ago Binary data parser helper with an parser
config.cr 14 over 4 years ago Easy to use configuration format parser
crinder 28 over 4 years ago Class based json renderer
Crystalizer 40 over 2 years ago (De)serialize any Crystal object; supporting JSON, YAML, and Byte formats out of the box
CSV parsing and generating for comma-separated values (Crystal stdlib)
front_matter.cr 11 about 4 years ago Separates a files front matter from its content
geoip2.cr 17 over 4 years ago GeoIP2 reader
HAR 22 over 1 year ago HAR (HTTP Archive) parser
INI INI file parser (Crystal stdlib)
JSON parsing and generating JSON documents (Crystal stdlib)
json-schema 13 over 2 years ago convert JSON serializable classes into a representation
JSON::OnSteroids 24 over 4 years ago handle and mutate JSON document easily
maxminddb.cr 23 almost 3 years ago MaxMindDB reader
toml.cr 60 over 1 year ago TOML parser
XML parsing and generating XML documents (Crystal stdlib)
YAML parsing and generating YAML documents (Crystal stdlib)

Awesome Crystal / Data Generators
faker 147 over 1 year ago A library for generating fake data
hashids.cr 52 over 5 years ago A library to generate YouTube-like ids from one or many numbers
prime 1 over 5 years ago A prime number generator

Awesome Crystal / Database Drivers/Clients
couchdb.cr 13 over 4 years ago CouchDB client
cryomongo 72 12 months ago MongoDB driver
crystal-db 304 11 months ago Common db api
crystal-ldap 19 over 4 years ago LDAP client
crystal-mysql 106 almost 2 years ago MySQL connector for Crystal
crystal-pg 463 about 1 year ago A Postgres driver
crystal-redis 377 over 2 years ago Full featured Redis client
crystal-rethinkdb 22 over 3 years ago Driver for RethinkDB / RebirthDB
crystal-sqlite3 140 about 1 year ago SQLite3 bindings
leveldb 39 over 5 years ago Crystal bindings for LevelDB
rocksdb.cr 38 almost 2 years ago RocksDB client
surrealdb.cr 5 about 2 years ago Unoffical SurrealDB HTTP & Websocket Client

Awesome Crystal / Database Tools
migrate 31 about 4 years ago A simpler database migration tool with transactions

Awesome Crystal / Debugging
backtracer.cr 15 about 2 years ago Shard aiming to assist with parsing backtraces into a structured form
debug.cr 95 11 months ago macro for -style debugging

Awesome Crystal / Dependency Injection
Athena Dependency Injection 9 11 months ago Robust dependency injection service container framework
Crystal-DI 33 over 7 years ago Lightweight DI Container
HardWire 21 over 1 year ago A compile-time non-intrusive dependency injection system
syringe 6 about 6 years ago A simple and basic dependency injection shard for crystal

Awesome Crystal / Email
carbon 84 about 1 year ago Fun, testable, and adapter-based email library
crystal-email 111 over 1 year ago Simple e-mail sending library
CrystalEmail A RFC compliant Email validator
sendgrid.cr 16 over 5 years ago Simple Sendgrid Client

Awesome Crystal / Environment Management
asdf-crystal 76 about 1 year ago Plugin for asdf version manager
crenv 238 over 6 years ago Crystal version manager
rcm.cr 45 over 5 years ago Redis Cluster Manager
vfox-crystal 7 over 1 year ago Plugin for vfox version manager

Awesome Crystal / Examples and funny stuff
blackjack-cr 9 about 1 year ago Console Blackjack
crystal-patterns 297 about 3 years ago Examples of GOF patters
crystalworld 43 over 4 years ago back-end API implementation
exercism-crystal 75 11 months ago Exercism exercises
try.cr 26 about 3 years ago Try monad

Awesome Crystal / Framework Components
Athena Event Dispatcher 13 11 months ago A Mediator and Observer pattern event library
Athena Negotiation 4 11 months ago Framework agnostic content negotiation library
device_detector 22 over 1 year ago Shard for detect device by user agent string
Exception Page 64 about 1 year ago An exceptional exception page for Crystal web libraries and frameworks
graphql 135 11 months ago Type-safe server implementation
graphql-crystal 215 over 5 years ago implementation
kemal-session 54 over 4 years ago Session handler for Kemal
mochi 25 almost 5 years ago Authentication shard inspired by Devise supporting: Authenticable, Confirmable, Invitable & more
motion.cr 54 over 4 years ago Object oriented frontend library for Amber
multi-auth 111 over 2 years ago Standardized multi-provider OAuth2 authentication (inspired by omniauth)
praetorian 59 almost 4 years ago Minimalist authorization library inspired by Pundit
Shield 55 about 1 year ago Comprehensive security for framework
shrine.cr 75 about 3 years ago File Attachment toolkit for Crystal applications. Heavily inspired by Shrine for Ruby
tourmaline 161 12 months ago Telegram bot framework with an API loosely based on

Awesome Crystal / Game Development
CrSFML 350 over 1 year ago Bindings to multimedia/game library
crystal-chipmunk 42 over 1 year ago Bindings to , a fast and lightweight 2D game physics library
crystal-imgui-sfml 18 over 1 year ago Bindings to integrate into an project
entitas.cr 37 11 months ago A Entity Component System Framework for Crystal
MyECS 21 over 1 year ago A Sparse Entity Component System Framework for Crystal
Raylib-cr 89 11 months ago Direct bindings to , which supports Linux, Windows, and Mac
SDL-Crystal-Bindings 9 over 1 year ago Direct (unsafe) bindings to , intended for writing own game libraries

Awesome Crystal / GUI Development
crystal-imgui 70 over 1 year ago Bindings to , an immediate-mode graphical UI library
GTK4.cr 103 over 1 year ago Bindings for with Crystalized API
Iu 71 over 1 year ago UI framework based on the library, with custom elements and modified bindings from
Ultimate GTK4 Crystal Guide Learn how to create premium GTK4 apps in Crystal

Awesome Crystal / HTML Builders
blueprint 48 about 1 year ago Write reusable and testable HTML templates in plain Crystal
form_builder.cr 31 almost 2 years ago Dead simple HTML form builder for Crystal with built-in support for many popular UI libraries such as Bootstrap
to_html 10 over 1 year ago The fastest HTML builder engine for Crystal
Water 28 over 4 years ago A library for writing HTML in plain Crystal

Awesome Crystal / HTML/XML Parsing
docx_cr_converter 7 over 2 years ago parse DOCX Word
myhtml 154 about 3 years ago Fast HTML5 Parser that includes CSS selectors

Awesome Crystal / HTTP
Cable 129 about 1 year ago An ActionCable "port" to Crystal, framework agnostic, 100% compatible with the ActionCable JS Client
cossack 106 over 5 years ago Simple flexible HTTP client
crest 236 11 months ago Simple HTTP and REST client, inspired by the Ruby's RestClient gem
crul 112 over 5 years ago Command line HTTP client
digest-auth 4 over 4 years ago Digest authentication
halite 171 over 3 years ago Crystal HTTP Requests with a chainable REST API, built-in sessions and loggers
http-multiserver.cr 23 almost 6 years ago Mounting multiple servers via routes (a.k.a. URL mapping)
http-params-serializable 21 over 4 years ago HTTP params (de)serialization, applicable to URL queries and URL-encoded forms
http-protection 72 over 2 years ago Protection against typical web attacks
http2 95 over 5 years ago HTTP/2 Protocol Implementation
HTTP::Client HTTP client (Crystal stdlib)
HTTP::Server HTTP server (Crystal stdlib)
HTTP::WebSocket HTTP WebSocket client (Crystal stdlib)
link-header 1 over 4 years ago HTTP Link Header Parser
ntlm 4 over 4 years ago NTLM authentication
proxy-fetcher.cr 9 almost 4 years ago Proxy lists fetching & validating library
sse.cr 23 11 months ago client

Awesome Crystal / Image processing
celestine 92 almost 2 years ago Create SVG images using a DSL
ffmpeg 20 over 1 year ago FFmpeg bindings that works with StumpyPNG to extract frames
Pluto 68 about 1 year ago A fast and convenient image processing library
stumpy_png 106 almost 2 years ago Read and write PNG images

Awesome Crystal / Implementations/Compilers
charly Charly Programming Language
cltk 73 over 2 years ago A crystal port of the Ruby Language Toolkit
crisp 44 over 2 years ago Lisp dialect implemented with Crystal
LinCAS-lang A programming language for scientific computation
mint-lang 4,065 11 months ago A refreshing programming language for the front-end web
myst-lang A practical, dynamic language designed to be written and understood as easily and efficiently as possible
novika 16 almost 2 years ago A free-form, moldable, interpreted programming language
runic-lang In-design toy language

Awesome Crystal / Internationalization
crystal-i18n 24 11 months ago An internationalization library inspired by Ruby-I18n
i18n.cr 22 over 4 years ago Internationalization shard
Lens 16 about 4 years ago A multiformat internationalization (i18n) shard for Crystal. Supports Gettext, Ruby YAML, etc
Rosetta 41 almost 2 years ago A blazing fast internationalization (i18n) library with compile-time key lookup supporting YAML and JSON formats

Awesome Crystal / Logging and monitoring
crafana 21 almost 2 years ago A library to help autogenerate dashboards
fiber_metrics.cr 8 over 3 years ago Track run time, wait time, or memory allocations per , method or block
Log logging utility (Crystal stdlib)
statsd.cr 33 over 2 years ago client library

Awesome Crystal / Machine Learning
ai4cr 28 about 4 years ago Artificial Intelligence (based on )
Cadmium 206 almost 4 years ago NLP library based heavily on
crystal-fann 85 almost 4 years ago FANN (Fast Artifical Neural Network) binding
mxnet.cr 22 over 4 years ago Bindings for
shainet 184 almost 3 years ago SHAInet (Neural Network in pure crystal)

Awesome Crystal / Markdown/Text Processors
cr-cmark-gfm 21 about 1 year ago Crystal C bindings for cmark-gfm to work with Commonmark and Github Flavored Markdown
markd 110 over 1 year ago Yet another markdown parser built for speed, Compliant to CommonMark specification

Awesome Crystal / Misc
aasm.cr 52 almost 3 years ago Easy to use finite state machine for Crystal classes
any_hash.cr 35 about 2 years ago Recursive Hash with better JSON::Any included
anyolite 162 about 1 year ago Full mruby interpreter with simple bindings, allowing for easy scripting support in projects
burocracia.cr 20 over 1 year ago burocracia.cr the dependecyless shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP
callbacks 12 over 4 years ago Expressive callbacks module
circuit_breaker 27 over 2 years ago Implementation of the circuit breaker pattern
CrSignals 10 almost 6 years ago Signals/slots notification library
crystal-binary_parser 18 over 3 years ago Binary parser
crystal-web-framework-stars 71 11 months ago Web frameworks for Crystal, most starred on Github
crz 90 over 4 years ago Functional programming library
defined 17 about 1 year ago macros for conditional compilation based on constant definitions, version requirements, or environment variable settings
emoji.cr 48 about 2 years ago Emoji library
gphoto2-web.cr 12 12 months ago Web API for libgphoto2
immutable 201 over 4 years ago Implementation of thread-safe, persistent, immutable collections
iterm2 6 over 4 years ago Display images within the terminal using the ITerm2 Inline Images Protocol
monads 47 about 3 years ago Monad implementation
observable 9 over 2 years ago Implementation of the observer pattern
pinger 11 over 3 years ago Ping IP addresses and DNS entries without requiring sudo
port_midi 6 over 1 year ago Crystal C bindings for the PortMIDI cross-platform MIDI I/O library
retriable.cr 41 over 1 year ago Simple DSL to retry failed code blocks
serf-handler.cr 1 over 4 years ago Framework for building Serf handlers, with a suite of useful builtin capabilities
simple_retry 6 over 4 years ago Simple tool for retrying failed code blocks
sslscan.cr 10 about 4 years ago Crystal shard wrapping the rbsec/sslscan utility
version_tools 9 over 5 years ago Version-dependent behaviour, specified at compile-time
wafalyzer 34 over 2 years ago Web Application Firewall (WAF) Detector - shard + cli
zaru_crystal 10 over 4 years ago Filename sanitization

Awesome Crystal / Network Protocols
amqp-client.cr 69 about 1 year ago AMQP 0-9.1, a messaging protocol, implemented by eg. RabbitMQ
connect-proxy 7 about 1 year ago Connect method style of HTTP tunnelling / HTTP proxy
cr-xmpp 16 over 4 years ago XMPP/Jabber Library
Crirc 21 almost 5 years ago IRC protocol implementation (Client, Server, Bots)
crystal-bacnet 0 about 1 year ago BACnet protocol implementation with BACnet/IP client
crystal-dns DNS protocol implementation and resolver
crystal-json-socket 13 almost 3 years ago JSON-socket client & server implementation. Inspired by and compatible with and
crystal-mqtt 20 over 1 year ago A MQTT client
crystal-snmp 16 about 4 years ago An SNMP implementation with version 1, 2c and 3 support
fast_irc.cr 22 over 4 years ago Fast IRC parser/generator
jwt 206 almost 2 years ago Implementation of JWT (JSON Web Token)
knx 3 about 1 year ago KNX protocol implementation supporting multicast, unicast and TCP/IP tunnelling
mDNS 8 almost 2 years ago DNS Service Discovery and multicast DNS
mqtt-client.cr 3 about 1 year ago A fast and lightweight MQTT client
msgpack-crystal 137 over 2 years ago MessagePack library
OAuth OAuth consumer (Crystal stdlib)
OAuth2 OAuth2 client (Crystal stdlib)
OpenSSL bindings to libssl (Crystal stdlib)
simple_rpc 68 over 2 years ago RPC Server and Client for Crystal. Implements msgpack-rpc protocol
stomp 1 about 1 year ago STOMP protocol
telnet.cr 11 over 4 years ago Telnet protocol
transfer_more Clone of transfer.sh to uploads files

Awesome Crystal / Networking
ipaddress.cr 43 about 2 years ago Library to handle IPv4 and IPv6 addresses
mac-address 2 about 4 years ago Library for working with MAC addresses

Awesome Crystal / ORM/ODM Extensions
avram 166 12 months ago A database wrapper for reading, writing, and migrating Postgres databases
clear 272 about 1 year ago ORM specialized to PostgreSQL only but with advanced features
crecto 343 almost 2 years ago Database wrapper, based on Ecto
granite 297 11 months ago ORM for Postgres, Mysql, Sqlite
jennifer.cr 420 about 1 year ago Active Record pattern implementation with flexible query chainable builder and migration system
rethinkdb-orm 24 over 3 years ago ORM for RethinkDB / RebirthDB

Awesome Crystal / Package Management
shards 766 12 months ago Dependency manager for the Crystal

Awesome Crystal / Processes and Threads
await_async 84 about 2 years ago Add keywords await & async in Crystal Lang
concurrent.cr 48 over 3 years ago Simplified concurrency using streams/pipelines, waitgroups, semaphores, smores and more
neph 204 over 2 years ago A modern command line job processor that can execute jobs concurrently
promise 42 about 1 year ago A Promise implementation with type inference
werk 27 over 1 year ago Dead simple task runner with concurrent support, ideal for local CI

Awesome Crystal / Project Generators
crystal_lib 138 about 1 year ago Automatic binding generator for native libraries
fez 49 about 4 years ago A Kemal application generator
libgen 79 about 1 year ago Automatic bindings generator configured using JSON/YAML files

Awesome Crystal / Queues and Messaging
crafka 17 over 1 year ago Apache Kafka library utilizing
mosquito 227 11 months ago Redis backed periodic and ad hoc job processing
NATS.io 44 almost 4 years ago NATS client
sidekiq.cr 763 about 1 year ago Simple, efficient job processing

Awesome Crystal / Routing
orion 123 over 3 years ago A minimal, rails-esque routing library
router.cr 263 over 4 years ago Minimum but powerful http router for HTTP::Server

Awesome Crystal / Scheduling
crystime Advanced time, calendar, schedule, and remind library
schedule.cr 74 about 5 years ago Run periodic tasks
tasker 56 over 1 year ago A high precision scheduler including timezone aware cron jobs

Awesome Crystal / Science and Data analysis
alea 12 over 3 years ago Repeatable sampling, CDF and other utilities to work with probability distributions
ishi 48 over 4 years ago Graph plotting package with a small API and sensible defaults powered by gnuplot
linalg 50 almost 2 years ago Linear algebra library inspired by MATLAB and SciPy.linalg
num.cr 151 over 1 year ago Numerical computing library supporting N-Dimensional data
predict.cr 17 over 5 years ago Satellite prediction library using the sgp4 model
quartz 15 over 4 years ago Modeling and simulation framework
hermes 37 over 4 years ago Data Mapper pattern implementation for ElastiSearch

Awesome Crystal / Serverless Computing
crystal_openfaas 23 about 1 year ago Template to enable crystal as first class citizens in OpenFaaS
secrets-env 6 over 4 years ago Extends ENV module to read values injected by docker / kubernetes secrets and other orchestration tools

Awesome Crystal / System
baked_file_system 177 over 2 years ago Virtual file system implementation
hardware 73 almost 4 years ago Get CPU, Memory and Network informations of the running OS and its processes

Awesome Crystal / Task management
cake 72 over 3 years ago Production-ready Make-like utility tool
sam 96 over 1 year ago Another one Rake-like task manager with namespacing and arguments system

Awesome Crystal / Template Engine
crinja 126 about 1 year ago An implementation of the
crustache 83 over 1 year ago for Crystal
ECR (Embedded Crystal) compile time template language which uses plain crystal expressions (Crystal stdlib)
Jbuilder 44 over 4 years ago Generate JSON objects with a Builder-style DSL, inspired by jbuilder
Kilt 151 over 3 years ago Abstraction layer for template engines
Slang 236 almost 3 years ago Lightweight, terse, templating language inspired by Ruby's Slim
teeplate 16 over 4 years ago A library for rendering multiple template files

Awesome Crystal / Testing
Athena Spec 2 11 months ago Common/helpful compliant testing utilities
crotest 28 almost 4 years ago A tiny and simple test framework
crytic 66 over 1 year ago Mutation testing framework
hashr 0 over 2 years ago A tiny class makes test on JSON response easier
LuckyFlow 51 over 1 year ago Automated browser tests similar to Capybara
mass-spec 8 over 2 years ago Web API testing library
microtest 31 almost 2 years ago Small opinionated testing library focusing on power asserts
minitest.cr 147 12 months ago Library for unit tests and assertions
mocks.cr 54 over 5 years ago Mocking library for Crystal
selenium.cr 26 about 1 year ago Selenium client for interacting with web pages for browser automation
Spec spec framework (Crystal stdlib)
spectator Feature rich spec framework that uses the modern expect syntax
timecop.cr 19 almost 3 years ago Library for mocking with . Inspired by the
vcr 58 about 3 years ago A HTTP capture and replay implementation for crystal
webdriver_pump 4 over 4 years ago Page Object library. Inspired by Ruby's
webmock.cr 103 over 2 years ago Library for stubbing requests

Awesome Crystal / Third-party APIs
amazonite 1 over 2 years ago An unofficial SDK supporting popular AWS APIs
aws-signer.cr 13 over 4 years ago This library signs your HTTP requests using AWS v4
awscr-s3 81 over 1 year ago AWS S3 interface
awscr-signer 22 over 3 years ago Sign HTTP::Request objects and generate presigned post forms
crystal-consul 17 over 5 years ago Consul API client
crystal-darksky 8 over 3 years ago Wrapper for the API
crystal-swapi 4 about 8 years ago Star Wars API (SWAPI) wrapper
crystal_slack 19 over 2 years ago A tool that parses Slack slash commands or send incoming web hooks
GDAX 7 about 6 years ago GDAX REST and WebSocket API Wrapper with request signing
gitlab.cr 29 over 4 years ago GitLab API wrapper
google 25 over 1 year ago Google API wrapper
host_meta 3 over 4 years ago A Web Host Metadata ( ) client
kube-client.cr 22 about 2 years ago Kubernetes API Client
mixpanel-crystal 0 about 6 years ago A library for sending events to Mixpanel
mollie.cr 19 over 1 year ago Payments API wrapper (Creditcard, PayPal, Apple Pay, Sofort, Klarna, ...)
office365 9 about 1 year ago Microsoft Graph API wrapper
pinboard.cr 5 almost 4 years ago API
raven.cr 123 11 months ago Raven is a client for
stripe.cr 49 over 1 year ago Stripe api wrapper
tmdb.cr 3 about 2 years ago The Movie DB (TMDb) api wrapper
twitter-crystal 82 about 5 years ago A library to access the Twitter API
web_finger 9 over 1 year ago A WebFinger ( ) client
ynab.cr 4 almost 5 years ago A library to interact with your YNAB data

Awesome Crystal / Validation
accord 24 almost 5 years ago Shareable validation library for Crystal Objects
Athena Validator 5 11 months ago Robust & flexible validation framework
validations 13 over 5 years ago Validations mixin
validator 30 over 4 years ago Data check and validation

Awesome Crystal / Web Frameworks
amber 2,578 11 months ago Open source efficient and cohesive web application framework
Athena 213 11 months ago A web framework comprised of reusable, independent components
grip 279 11 months ago The microframework for writing powerful web applications
kemal 3,658 about 1 year ago Lightning Fast, Super Simple web framework. Inspired by Sinatra
lucky 2,607 about 1 year ago Catch bugs early, forget about most performance issues, and spend more time on code instead of debugging and writing tests
marten 422 11 months ago A web framework that makes building web applications easy, productive, and fun
runcobo 50 over 3 years ago An api framework with simple, intuitive and consistent DSL, using jbuilder to render json
Shivneri 23 over 4 years ago Component based MVC web framework for crystal targeting good code structures, modularity & performance
spider-gazelle 180 about 1 year ago A Rails esque web framework with a focus on speed and extensibility

Community
Crystal Forum
Crystal newsletter
Gitter
IRC #crystal-lang on Libera
Reddit
Stackoverflow

Community / Unofficial
Chinese-speaking Telegram Group 来吧！TG 中文圈的朋友们！
Crystal Programming Discord Server Unofficial Discord server dedicated to the Crystal Programming Language
Portuguese-speaking Telegram Group Bem vindos ao Crystal Brasil!
Russian-speaking Telegram Group Добро пожаловать, товарищ!

Resources
Crystal for Rubyists Free book to bootstrap your Crystal journey
Crystal Shards for Ruby Gems 19,526 11 months ago A list of Ruby Gems and their Crystal Shards equivalents
crystal-koans 49 12 months ago Learn Crystal by writing unit tests
crystal-lang.org Official language site
devdocs.io API Documentation Browser with Crystal support
Learn X in Y minutes Quick tutorial on Crystal
Programming Crystal PragProg book to start your Crystal journey
Usability of Programming Languages Comparison of Python, Rust, Crystal

Resources / Official Documentation Translations
br.crystal-lang.org Brazilian
ja.crystal-lang.org Japanese
kr.crystal-lang.org Korean
ru.crystal-lang.org Russian
tw.crystal-lang.org Chinese Traditional

Services and Apps
carc.in A web service that runs your code and displays the result
Crank 51 over 5 years ago A Procfile-based application manager (like Foreman)
cry 34 about 4 years ago Ability to execute crystal code in a fashion similar to Ruby's pry edit
Crystal [ANN] Announce new project, blog post, version update or any other Crystal work
DeBot 35 over 4 years ago IRC bot written in Crystal
icr 505 about 4 years ago Interactive console for Crystal (like IRB for Ruby)
Invidious 16,540 12 months ago Invidious is an alternative front-end to YouTube
mpngin 34 about 2 years ago A URL shortener with simple stats
procodile 8 11 months ago Run processes in the background (and foreground) on Mac & Linux from a Procfile (for production and/or development environments)
quicktype Generate models and serializers from JSON, JSON Schema, GraphQL, and TypeScript
shards.info Web service that lists all repositories on GitHub that have Crystal code in them. The sources are available on

Tools
ast_helper 25 almost 6 years ago Helper tool to debug parser and formatter
crystal-base 2 about 8 years ago CentOS base docker image for Crystal development
crystal-dash-docset 17 11 months ago docset generator
port_ruby_to_crystal 9 12 months ago A regex replace ruby script for port ruby code to crystal easier, reduce friction
public_suffix 2 over 4 years ago A small library designed to make the Public Suffix List ( ) easier to use

Tools / DevOps
ansible-crystal 9 over 1 year ago Ansible playbook for installing crystal
DPPM 116 over 5 years ago An easy, universal way to install and manage applications as packages (mostly Linux)

Tools / Editor Plugins / Acme:
acmecrystal 6 about 6 years ago Reformats crystal code in acme

Tools / Editor Plugins / Atom
crystal-tools Enables built in tools in Crystal compiler
language-crystal-actual Crystal language support in Atom

Tools / Editor Plugins / Emacs
crystal-mode Crystal language support for Emacs ( )

Tools / Editor Plugins / Geany
geany-crystal 9 over 2 years ago Crystal support for the

Tools / Editor Plugins / IntelliJ IDEA
intellij-crystal-lang 38 almost 2 years ago Crystal support for the JetBrains IDEs

Tools / Editor Plugins / Lite-XL
lite-plugin-crystal 6 over 2 years ago Crystal support for the editor

Tools / Editor Plugins / Spacemacs
crystal-spacemacs-layer 12 about 9 years ago Spacemacs contribution layer for Crystal

Tools / Editor Plugins / Sublime
sublime-crystal 86 over 2 years ago Crystal syntax highlighting for sublime Text

Tools / Editor Plugins / TextMate
Crystal.tmbundle 18 over 2 years ago Crystal syntax highlighting, compile, format command, snippets

Tools / Editor Plugins / Vim
vim-crystal 418 over 2 years ago Vim filetype support for Crystal
vim-slang 12 over 9 years ago Vim filetype support for Slang Templating Engine

Tools / Editor Plugins / Visual Studio Code
vscode-crystal-lang 280 12 months ago Formatter, linter and syntax highlighting for and files

Tools / LSP Language Server Protocol Implementations
crystalline 452 about 1 year ago Crystalline is an implementation of the Language Server Protocol written in and for the Crystal Language
scry 332 over 2 years ago Code analysis server for Crystal implementing the

Tools / Shell plugins
crun 45 almost 2 years ago Crystal Run : shebang wrapper for Crystal
crystal-zsh 27 over 5 years ago .oh-my-zsh plugin

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