Awesome Crystal

A curated list of awesome Crystal code and resources. Inspired by awesome and awesome-awesomeness.

The goal is to have projects mostly stable and useful for users.

Contributions are welcome. Please take a quick look at the contribution guidelines first.

• Awesome Crystal
  • Algorithms and Data structures
  • Api Builders
  • Caching
  • Cli Builders
  • Configuration
  • Data Generators
  • Database Drivers
  • Environment Management
  • Examples and funny stuff
  • Framework Components
  • HTTP
  • Implementations/Compilers
  • Low level bindings
  • Misc
  • Networking
  • ORM/ODM Extensions
  • Package Management
  • Project generators
  • Search
  • Task management
  • Template Engine
  • Testing
  • Third-party APIs
  • Virtualization
  • Web Frameworks
  • Web Servers
• Community
• Resources
• Services and Apps
• Tools
  • DevOps
  • Editor Plugins
  • Shell Plugins

Algorithms and Data structures

• crystalline - A collection of containers and algorithms
• delimiter_tree - A tree structure that is built using a delimiter
• heap.cr - Implementation of heap data structure
• miller_rabin - Implements Miller-Rabin algorithm to check if a number is prime
• multiset.cr - Implementation of a multiset
• murmur3 - Implementation of Murmur3 hash algorithm used by Cassandra
• radix - Radix Tree implementation

Api Builders

• crystal_api - Simple PostgreSQL REST API with Rails devise-like auth

Caching

• Bloom Filter - Implementation of Bloom filter
• crystal-memcached - Implementation of a memcached client

Cli Builders

• commander - Command-line interface builder
• completion - Easy command line completion engine
• docopt - A docopt.org port
• optarg - Yet another library for parsing command-line options and arguments

Configuration

• ambience - Simple app configuration using ENV.
• crystal-toml - TOML parser

Data Generators

• faker - A library for generating fake data
• random.cr - Random number generation, provides interface for the SIMD-oriented Fast Mersenne Twister (dSFMT)

Database Drivers

• crystal-mysql - Basic MySQL bindings
• crystal-pg - A Postgres driver
• crystal-redis - Full featured Redis client
• crystal-sqlite3 - SQLite3 bindings
• influxdb.cr - InfluxDB driver
• mongo.cr - Binding for MongoDB C driver

Environment Management

• crenv - Crystal version manager

Examples and funny stuff

• crystal-patterns - Examples of GOF patters
• crystal_samples - Variety of Crystal samples
• docker-kemal - An example Dockerized Crystal Kemal project
• kemal-chat - Build realtime applications with Kemal and WebSocket
• kemal-pg-sample - Sample app to demonstrate kemal + postgresql usage
• kemal-react-chat - Build Realtime Web applications with Kemal and React

Framework Components

• artanis - Sinatra-like DSL (abusing macros)
• crystal-mime - Mimetypes for Crystal
• kemal-comments - Simple comments for Kemal site
• kemal-mysql - Easily add MySQL database to Kemal
• kemal-pg - Easily add Postgresql database to Kemal
• kemal-redis - Easily add Redis to Kemal
• kemal-session - Session handler for Kemal
• spec-kemal - Easy testing for Kemal

HTTP

• beryl - Action-focused HTTP routing library
• crul - Command line HTTP client
• cryload - HTTP benchmarking tool
• crystal-routing - Extensible library to deal with http request and string based routing
• helmet - Set security-related HTTP headers
• http2 - HTTP/2 Protocol Implementation
• http_parser.cr - Wrapper for Http Parser lib
• router-simple.cr - Simple path router
• session - Cookie based sessions in Crystal HTTP applications

Implementations/Compilers

• crisp - Lisp dialect implemented with Crystal
• crystal - Crystal itself is written in Crystal
• onix - ONYX Programming Language

Low level bindings

• crsfml - Bindings for Simple and Fast Multimedia Library (through CSFML)
• crystal-dbus - Bindings to D-Bus
• curses - Bindings for the curses library
• duktape.cr - Bindings for the Duktape javascript engine
• kt - Bindings for Kyoto Tycoon
• myhtml - Bindings for lexborisov/myhtml
• openssl.cr - Bindings for OpenSSL library
• posix - POSIX/C bindings
• snappy-crystal - Bindings for Snappy library
• ssh2.cr - Bindings for libssh2 library
• termbox-crystal - Bindings and extension library for termbox (terminal UI library)
• zlib.cr - Bindings for ZLib library

Misc

• aasm.cr - Easy to use finite state machine for Crystal classes
• chalk-box - Terminal color toolbox, check support and colorized (without String monkey patch)
• crdoc - CLI tool to search and open documentation
• cron_scheduler - Job scheduler with crontab patterns
• crystal-diff - A Crystal sequence differencing implementation
• crystal-futures - Future type implementation
• crystal-i18n - Internationalization library
• emoji.cr - Emoji library
• evented - A micro library to publish and subscribe for Crystal objects
• guardian - File change watcher for Crystal and Non-Crystal libs
• haikunator - Heroku-like random name generator
• html_builder - DSL for creating HTML
• immutable - Implementation of thread-safe, persistent, immutable collections
• kreal - Model sharing & RPC library built on and works with Kemal seamlessly
• lambda.cr - Uniformed function call syntax
• primes - Library for testing if a number is prime and finding its prime factorization
• progress - [==..] Progress bar
• raytracer-crystal - CPU Raytracer with examples
• spinner - Terminal Spinner
• syscall.cr - Raw syscall interface

Networking

• amqp.cr - AMQP 0.9.1 client with RabbitMQ extensions
• bson.cr - Native BSON implementation
• jwt - Implementation of JWT (JSON Web Token)
• msgpack-crystal - MessagePack library

ORM/ODM Extensions

• active_record.cr - Active Record pattern implementation
• amethyst-model - ORM Model for the Amethyst Framework

Package Management

• shards - Dependency manager for the Crystal

Project generators

• generate - A tool for generating whole Crystal project structure, or any part of it during lifetime of project

Search

• soegen - Elasticsearch client for Crystal similar to the stretcher gem for ruby

Task management

• crake - Rake-like build utility library. It is just a library, so it does not provide CLI
• lake - Rake-like task management for Crystal programs

Template Engine

• Bunny - A simple HTML templating language for Crystal, same syntax as erb
• crustache - {{Mustache}} for Crystal
• Kilt - Abstraction layer for template engines.
• Slang - Lightweight, terse, templating language inspired by Ruby's Slim.
• temel - Extensible HTML::Builder alternative for Crystal, supports custom tag definitions

Testing

• crotest - A tiny and simple test framework
• matchi - Collection of expectation matchers
• minitest.cr - Library for unit tests and assertions
• mock - Mocking library, inspired by the API of rspec-mocks
• mocks.cr - Mocking library for Crystal
• power_assert.cr - Powerful assertion for Crystal
• spec2.cr - Enhanced testing library
• timecop.cr - Library for mocking with Time.now. Inspired by timecop ruby gem
• webmock.cr - Library for stubbing HTTP::Client requests

Third-party APIs

• airbrake-crystal - A Crystal notifier for Airbrake
• AnyBar_cr - Simple crystal wrapper for AnyBar library
• crystal-qiita - A wrapper for the Qiita API
• crystal_brium - Access Brium's API using Crystal
• crystal_slack - A tool that parses Slack slash commands or send incoming web hooks
• docker.cr - Docker API client
• google_maps_api - Google Maps API
• gravatar.cr - A library to use Gravatar service
• shorturl.cr - A library to use URL shortening services
• soundcloud-crystal - A library to access the SoundCloud API
• spotify.cr - A library to access the Spotify API
• TelegramBot - A wrapper for the Telegram Bot API
• twitter-crystal - A library to access the Twitter API

Virtualization

• rcpu - A virtual machine emulator and assembler

Web Frameworks

• amatista - A web framework to create quick applications
• amethyst - A Rails inspired web-framework
• carbon-crystal - A framework with Rails in mind
• chocolate - Simple web framework and template engine
• frost - Full featured MVC Web Framework, largely inspired by Ruby on Rails
• iceberg - A full-stack web framework
• kemal - Lightning Fast, Super Simple web framework. Inspired by Sinatra
• kemalyst - A rails like framework based on kemal
• moonshine - A minimal web framework

Web Servers

• fast-http-server - Super fast, zero configuration command line HTTP Server.
• kamber - Blog server based on Kemal
• prax.cr - Rack proxy server for development

Community

• Crystal Shards on Twitter
• Crystal weekly newsletters
• Google Group
• Reddit
• Slack Group
• Stackoverflow

Resources

• crystal-lang - Official language site

Services and Apps

• carc.in - A web service that runs your code and displays the result
• Crank - A Procfile-based application manager (like Foreman)
• crystalshards - A web service that lists all available Crystal shards
• DeBot - IRC bot written in Crystal
• docrystal - A web application that hosts documentation for Crystal packages
• fikri - Simple CLI To-Do App
• icr - Interactive console for Crystal (like IRB for Ruby)
• nes - A NES emulator
• vicr - Vim-like Interactive CRystal

Tools

DevOps

• crystal-cookbook - Chef cookbook for installing crystal

Editor Plugins

• Atom
  • crystal-tools - Enables built in tools in Crystal compiler
  • language-crystal-actual - Crystal language support in Atom
  • linter-crystal - Lint Crystal using the Crystal compiler in Atom
• Emacs
  • emacs-crystal-mode - Crystal language support for Emacs
• Sublime
  • sublime-crystal - Crystal syntax highlighting for sublime Text
• Vim
  • vim-crystal - Vim filetype support for Crystal
  • vim-slang - Vim filetype support for Slang Templating Engine

Shell plugins

• crystal-zsh - .oh-my-zsh plugin