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awesome-crystal

A collection of awesome Crystal libraries, tools, frameworks and software
https://github.com/eric-erki/awesome-crystal

Last synced: about 14 hours ago
JSON representation

Algorithms and Data structures
- bisect - Inserting values into a sorted array
- crie - Compile-time Trie
- CrOTP - HOTP and TOTP implementation for two factor authentication
- crystal-diff - A Crystal sequence differencing implementation
- crystal-linked-list - Implementation of Linked List
- crystaledge - A pure Vector Math library
- crystalg - A Generic Algorithm Library
- crystalline - A collection of containers and algorithms
- edits.cr - Collection of edit distance algorithms
- graphlb - Collection of graph datastructure and algorithms
- hash_ring - An Implementation of Consistent Hash Ring
- haversine - An Implementation of the Haversine formula
- kd_tree - An implementation of "K-Dimensional Tree" and "N-Nearest Neighbors"
- ksuid.cr - K-Sortable Globally Unique IDs
- markov - Build Markov Chains and run Markov Processes
- multiset.cr - Implementation of a multiset
- oak - A flexible Radix Tree implementation
- radix - Radix Tree implementation
- ternary_search_tree - Ternary Search Tree
- crystalg - A Generic Algorithm Library
- hash_ring - An Implementation of Consistent Hash Ring
Api Builders
- kemal-rest-api - A library to create RESTful API with Kemal
Blockchain
- Cocol - A minimal blockchain testbed
- secp256k1.cr - Elliptic curve used in the public-private-key cryptography
- SushiChain - A custom blockchain platform
- SushiChain - A custom blockchain platform
C bindings
- asound-cr - Bindings for ALSA/libasound
- cairo-cr - Bindings for [Cairo](https://cairographics.org/) graphics library
- clang.cr - Libclang bindings
- crt.cr - Bindings for libncursesw and crt
- crystal-gsl - GNU Scientific Library bindings
- crystal-hunspell - Bindings for [Hunspell](https://hunspell.github.io/)
- curl-crystal - Bindings for [libcurl](https://curl.haxx.se/libcurl/)
- duktape.cr - Bindings for the [Duktape](https://github.com/svaarala/duktape) javascript engine
- gphoto2.cr - Bindings for the [libgphoto2](http://www.gphoto.org/) library
- icu.cr - Bindings for the [ICU](http://site.icu-project.org/) library
- libnotify.cr - Bindings for Libnotify
- pcap.cr - Bindings for libpcap
- pledge.cr - Bindings for OpenBSD's `pledge(2)`
- soundfile - Bindings for [libsndfile](http://www.mega-nerd.com/libsndfile/) library
- ssh2.cr - Bindings for libssh2 library
- syslog.cr - Bindings for `syslog`
- x11-cr - X11 bindings
- x_do.cr - Bindings for libxdo ([`xdotool`](https://github.com/jordansissel/xdotool))
Caching
- bloom_filter - Implementation of Bloom filter
- bojack - A non-reliable in-memory key-value store
- crystal-memcached - Implementation of a memcached client
- Nuummite - A tiny persistent embedded key-value store
CLI Builders
- admiral - A robust DSL for writing command line interfaces
- cli - Library for building command-line interface applications
- clicr - A simple declarative command line interface builder
- clim - Slim command line interface builder
- commander - Command-line interface builder
- optarg - Yet another library for parsing command-line options and arguments
- Phreak - A highly flexible Crystal CLI builder in the style of OptionParser
- OptionParser - command-line options processing (Crystal stdlib)
- OptionParser - command-line options processing (Crystal stdlib)
- OptionParser - command-line options processing (Crystal stdlib)
CLI Utils
- cride - A light CLI text editor/IDE
- oq - A performant, and portable jq wrapper to facilitate the consumption and output of formats other than JSON; using [jq](https://github.com/stedolan/jq) filters to transform the data.
- progress_bar.cr - A simple and customizable progress bar
- tablo - A flexible terminal table generator
- tallboy - Generate ASCII character tables with support for spanning cells over multiple columns
- terminal_table.cr - Simple ASCII table generator
- terminimal - A tiny CLI toolkit for building terminal apps for humans
- todo - Todo list working in command line
Code Analysis and Metrics
- ameba - A static code analysis tool
Compression
- Crystar - Readers and writers of Tar archive format
- snappy - Snappy compression format reader/writer for Crystal
- zstd.cr - Bindings for [Zstandard](https://github.com/facebook/zstd) compression library
- Gzip - readers and writers of gzip format (Crystal stdlib)
- Zlib - readers and writers of zlib format (Crystal stdlib)
- Gzip - readers and writers of gzip format (Crystal stdlib)
- Gzip - readers and writers of gzip format (Crystal stdlib)
Configuration
- cr-dotenv - Loads .env file
- envyable - A simple YAML to ENV config loader
- habitat - Type safe configuration for your classes and modules
- totem - Load and parse a configuration in JSON, YAML, dotenv formats
Converters
- base62.cr - Base62 encoder/decoder, well suited for url-shortening
- money - Handling money and currency conversion with ease (almost complete port of [RubyMoney](https://github.com/RubyMoney/money))
- ms - Library to easily convert various time formats to milliseconds and milliseconds to human readable format
- sass.cr - Compile SASS/SCSS to CSS ([libsass](https://github.com/sass/libsass/) binding)
- time_format.cr - Convert time in human readable format with ease
- turkish-number - Turn integers into the Turkish words
- wkhtmltopdf-crystal - Bindings / wrapper for libwkhtmltox (HTML to PDF / image converter)
Cryptography
- cmac - Crystal implementation of Cipher-based Message Authentication Code (CMAC)
- sodium.cr - Crystal wrapper for the libsodium crypto API
- openssl.cr - This library provides binding for OpenSSL library
Data Formats
- BinData - Binary data parser helper with an [ASN.1](https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One) parser
- config.cr - Easy to use configuration format parser
- crinder - Class based json renderer
- front_matter.cr - Separates a files front matter from its content
- geoip2.cr - GeoIP2 reader
- HAR - HAR (HTTP Archive) parser
- JSON tools - An implementation of JSON Patch and Pointer RFC's
- JSON::OnSteroids - handle and mutate JSON document easily
- maxminddb.cr - MaxMindDB reader
- toml.cr - TOML parser
- CSV - parsing and generating for comma-separated values (Crystal stdlib)
- INI - INI file parser (Crystal stdlib)
- JSON - parsing and generating JSON documents (Crystal stdlib)
- XML - parsing and generating XML documents (Crystal stdlib)
- YAML - parsing and generating YAML documents (Crystal stdlib)
- CSV - parsing and generating for comma-separated values (Crystal stdlib)
- INI - INI file parser (Crystal stdlib)
- JSON - parsing and generating JSON documents (Crystal stdlib)
- XML - parsing and generating XML documents (Crystal stdlib)
- YAML - parsing and generating YAML documents (Crystal stdlib)
- CSV - parsing and generating for comma-separated values (Crystal stdlib)
- INI - INI file parser (Crystal stdlib)
- JSON - parsing and generating JSON documents (Crystal stdlib)
- XML - parsing and generating XML documents (Crystal stdlib)
- YAML - parsing and generating YAML documents (Crystal stdlib)
Data Generators
- faker - A library for generating fake data
- hashids.cr - A library to generate YouTube-like ids from one or many numbers
Database Drivers/Clients
- couchdb.cr - CouchDB client
- crystal-db - Common db api
- crystal-mysql - MySQL connector for Crystal
- crystal-pg - A Postgres driver
- crystal-redis - Full featured Redis client
- crystal-rethinkdb - Driver for RethinkDB / RebirthDB
- crystal-sqlite3 - SQLite3 bindings
- eventql-crystal - EventQL driver
- leveldb - Crystal bindings for LevelDB
- mongo.cr - Binding for MongoDB C driver
- rocksdb.cr - RocksDB client
Database Tools
- migrate - A simpler database migration tool with transactions
- queryit - A setupless terminal based SQL query runner.
Debugging
- debug.cr - `debug!(…)` macro for `pp`-style debugging
Dependency Injection
- Crystal-DI - Lightweight DI Container
- syringe - A simple and basic dependency injection shard for crystal
- Crystal-DI - Lightweight DI Container
Development Tools
- kemal-watcher - Kemal plugin to watch files and live-reload the browser
- sentry-run - Reload code changes using Sentry.run
- Warden - Watches files, run command and a git command if succeed on file changes
- watcher - Watch file changes using File.stat
Email
- carbon - Fun, testable, and adapter-based email library
- crystal-email - Simple e-mail sending library
- sendgrid.cr - Simple Sendgrid Client
- CrystalEmail - A RFC compliant Email validator
Environment Management
- asdf-crystal - Plugin for asdf version manager
- crenv - Crystal version manager
- rcm.cr - Redis Cluster Manager
- asdf-crystal - Plugin for asdf version manager
- crenv - Crystal version manager
Examples and funny stuff
- blackjack-cr - Console Blackjack
- clamp - Clamp any Comparable
- crystal-patterns - Examples of GOF patters
- crystalworld - [realworld.io](https://realworld.io) back-end API implementation
- exercism-crystal - Exercism exercises
- try.cr - Try monad
Feature Flipping
- can_use - It is a minimalist feature toggle/flag for crystal based on yaml
- flipper - Feature flipping/flags/rollouts. Supports multiple backends
Framework Components
- device_detector - Shard for detect device by user agent string
- Exception Page - An exceptional exception page for Crystal web libraries and frameworks
- graphql-crystal - [Graphql](http://graphql.org) implementation
- kave - Kemal API Version Extension
- kemal-session - Session handler for Kemal
- multi-auth - Standardized multi-provider OAuth2 authentication (inspired by omniauth)
- praetorian - Minimalist authorization library inspired by Pundit
- request_id - Middleware for generates / pick up a unique request ID for Crystal servers
- response_time - Response time for Crystal servers (pure http server, kemal, etc.)
- shrine.cr - File Attachment toolkit for Crystal applications. Heavily inspired by Shrine for Ruby
- tourmaline - Telegram bot framework with an API loosely based on [telegraf.js](https://telegraf.js.org/)
- tourmaline - Telegram bot framework with an API loosely based on [telegraf.js](https://telegraf.js.org/)
Game Development
- CrSFML - Bindings to [SFML](https://www.sfml-dev.org/) multimedia/game library
- crystal-chipmunk - Bindings for [Chipmunk](http://chipmunk-physics.net/), a fast and lightweight 2D game physics library
- glove - A library for gaming development
- glove - A library for gaming development
HTML Builders
- form_builder.cr - Dead simple HTML form builder for Crystal with built-in support for many popular UI libraries such as Bootstrap
- html_builder - DSL for creating HTML
HTML/XML Parsing
- gumbo-crystal - Bindings for [Gumbo](https://github.com/google/gumbo-parser), an HTML5 parsing library made by Google
- hq.cr - Simple wrapper for crystal-xml
- myhtml - Fast HTML5 Parser that includes CSS selectors
HTTP
- Cable - An ActionCable "port" to Crystal, framework agnostic, 100% compatible with the ActionCable JS Client
- cossack - Simple flexible HTTP client
- crest - Simple HTTP and REST client, inspired by the Ruby's RestClient gem
- crul - Command line HTTP client
- cryload - HTTP benchmarking tool
- halite - Crystal HTTP Requests with a chainable REST API, built-in sessions and loggers
- helmet - Set security-related HTTP headers
- http-multiserver.cr - Mounting multiple servers via routes (a.k.a. URL mapping)
- http-params-serializable - HTTP params (de)serialization, applicable to URL queries and URL-encoded forms
- http-protection - Protection against typical web attacks
- http2 - HTTP/2 Protocol Implementation
- keyer_cr - Adds HTTP GET/POST parameter parsing as a Hash-like object
- proxy-fetcher.cr - Proxy lists fetching & validating library
- resp-crystal - Lightweight RESP client
- sse.cr - [Server-Sent Events](https://www.w3.org/TR/2009/WD-eventsource-20090421) client
- HTTP::Client - HTTP client (Crystal stdlib)
- HTTP::Server - HTTP server (Crystal stdlib)
- HTTP::WebSocket - HTTP WebSocket client (Crystal stdlib)
- HTTP::Client - HTTP client (Crystal stdlib)
- HTTP::Server - HTTP server (Crystal stdlib)
- HTTP::WebSocket - HTTP WebSocket client (Crystal stdlib)
- HTTP::Client - HTTP client (Crystal stdlib)
- HTTP::Server - HTTP server (Crystal stdlib)
- HTTP::WebSocket - HTTP WebSocket client (Crystal stdlib)
Image processing
- libpixel.cr
- magickwand-crystal - Bindings for [MagickWand](https://www.imagemagick.org/script/magick-wand.php), the C interface for ImageMagick processing libraries
- stumpy_png - Read and write PNG images
Implementations/Compilers
- cltk - A crystal port of the Ruby Language Toolkit
- cppize - Crystal-to-C++ transpiler
- crisp - Lisp dialect implemented with Crystal
- crow - Transpile/compile Crystal to [Flow](https://flow.org/)
- mint-lang - A refreshing programming language for the front-end web
- charly - Charly Programming Language
- LinCAS-lang - A programming language for scientific computation
- myst-lang - A practical, dynamic language designed to be written and understood as easily and efficiently as possible
- runic-lang - In-design toy language
- myst-lang - A practical, dynamic language designed to be written and understood as easily and efficiently as possible
Logging and monitoring
- crafana - A [Grafana](https://grafana.com/) library to help autogenerate dashboards
- crometheus - A [Prometheus](https://prometheus.io/) client library
- crylog - Flexible logging framework based on Monolog
- fluent-logger-crystal - A structured logger for [Fluentd](https://www.fluentd.org/)
- statsd.cr - [Statsd](https://github.com/etsy/statsd) client library
- syslog.cr - Implementation of Syslog client
- fluent-logger-crystal - A structured logger for [Fluentd](https://www.fluentd.org/)
Machine Learning
- ai4cr - Artificial Intelligence (based on https://github.com/SergioFierens/ai4r)
- Cadmium - NLP library based heavily on [natural](https://github.com/NaturalNode/natural)
- crystal-fann - FANN (Fast Artifical Neural Network) binding
- shainet - SHAInet (Neural Network in pure crystal)
- tensorflow.cr - Bindings for [TensorFlow](https://github.com/tensorflow/tensorflow)
Markdown/Text Processors
- html-pipeline - HTML processing filters and utilities
- markd - Yet another markdown parser built for speed, Compliant to CommonMark specification
- html-pipeline - HTML processing filters and utilities
Misc
- aasm.cr - Easy to use finite state machine for Crystal classes
- any_hash.cr - Recursive Hash with better JSON::Any included
- atomic_write.cr - Library for writing or apppending files atomically
- burocracia.cr - burocracia.cr the dependecyless shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP
- callbacks - Expressive callbacks module
- circuit_breaker - Implementation of the circuit breaker pattern
- containerregistry.cr - Library for working with container registries
- CrSerializer - Extensible annotation based serialization/deserialization library
- CrSignals - Signals/slots notification library
- crystal-binary_parser - Binary parser
- crystal-web-framework-stars - Web frameworks for Crystal, most starred on Github
- crz - Functional programming library
- emoji.cr - Emoji library
- i18n.cr - Internationalization shard
- immutable - Implementation of thread-safe, persistent, immutable collections
- inflector.cr - Singularize, pluralize, camelize, etc (port from ActiveSupport)
- lirith - Graphics engine
- m3u8 - Generate and parse m3u8 playlists for HTTP Live Streaming
- message_verifier.cr - Verify and generate Rails `ActiveSupport::MessageVerifier` signed tokens
- monads - Monad implementation
- pangu.cr - Paranoid text spacing in Crystal
- pinger - Ping IP addresses and DNS entries without requiring sudo
- port_midi - Crystal C bindings for the PortMIDI cross-platform MIDI I/O library
- retriable.cr - Simple DSL to retry failed code blocks
- tren - Give your SQL some love
- ulid - Universally Unique Lexicographically Sortable Identifier (ULID)
- zaru_crystal - Filename sanitization
- hoop - Building native OSX apps
- burocracia.cr - burocracia.cr the dependecyless shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP
- lirith - Graphics engine
Network Protocols
- bson.cr - Native BSON implementation
- connect-proxy - Connect method style of HTTP tunnelling / HTTP proxy
- cr-xmpp - XMPP/Jabber Library
- Crirc - IRC protocol implementation (Client, Server, Bots)
- crystal-json-socket - JSON-socket client & server implementation. Inspired by and compatible with [node-json-socket](https://github.com/sebastianseilund/node-json-socket/) and [ruby-json-socket](https://github.com/foi/ruby-json-socket)
- crystal-snmp - An SNMP implementation with version 1, 2c and 3 support
- fast_irc.cr - Fast IRC parser/generator
- gopher.cr - Gopher server toolkit
- jwt - Implementation of JWT (JSON Web Token)
- msgpack-crystal - MessagePack library
- telnet.cr - Telnet protocol
- transfer_more - Clone of transfer.sh to uploads files
- OAuth - OAuth consumer (Crystal stdlib)
- OAuth2 - OAuth2 client (Crystal stdlib)
- OpenSSL - bindings to libssl (Crystal stdlib)
- OAuth - OAuth consumer (Crystal stdlib)
- OAuth2 - OAuth2 client (Crystal stdlib)
- OpenSSL - bindings to libssl (Crystal stdlib)
- OAuth - OAuth consumer (Crystal stdlib)
- OAuth2 - OAuth2 client (Crystal stdlib)
- OpenSSL - bindings to libssl (Crystal stdlib)
Networking
- ipaddress.cr - Library to handle IPv4 and IPv6 addresses
ORM/ODM Extensions
- avram - A database wrapper for reading, writing, and migrating Postgres databases.
- clear - ORM specialized to PostgreSQL only but with advanced features
- crecto - Database wrapper, based on Ecto
- granite - ORM for Postgres, Mysql, Sqlite
- jennifer.cr - Active Record pattern implementation with flexible query chainable builder and migration system
- ohm-crystal - Object-hash mapping library for Redis
- onyx-sql - DB-agnostic SQL ORM with beautiful DSL and type-safe Query builder
- redis-tsv.cr - Import and export data from Redis in TSV format
- rethinkdb-orm - ORM for RethinkDB / RebirthDB
- stal-crystal - Set algebra solver for Redis
- topaz - A simple and useful db wrapper
Package Management
- shards - Dependency manager for the Crystal
Processes and Threads
- await_async - Add keywords await & async in Crystal Lang
- crystal-futures - Future type implementation
- neph - A modern command line job processor that can execute jobs concurrently
- promise - A Promise implementation with type inference
Project Generators
- crystal_lib - Automatic binding generator for native libraries
- fez - A Kemal application generator
- kgen - Kemalyst command line tool for console, init, generate (scaffolding), and watch.
- libgen - Automatic bindings generator configured using JSON/YAML files
- wasp - Static Site Generator
Queues and Messaging
- dispatch - In memory asynchronous job processing
- mosquito - Redis backed periodic and ad hoc job processing
- NATS.io - NATS client
- mosquito - Redis backed periodic and ad hoc job processing
- sidekiq.cr - Simple, efficient job processing
Routing
- orion - A minimal, rails-esque routing library
- router.cr - Minimum but powerful http router for HTTP::Server
- toro - Tree Oriented Routing
Scheduling
- crystime - Advanced time, calendar, schedule, and remind library
- schedule.cr - Run periodic tasks
- tasker - A high precision scheduler including timezone aware cron jobs
Science and Data analysis
- linalg - Linear algebra library inspired by MATLAB and SciPy.linalg
- num.cr - Numerical computing library supporting N-Dimensional data
- predict.cr - Satellite prediction library using the sgp4 model
- stats - An expressive implementation of statistical distributions
Search
- hermes - Data Mapper pattern implementation for ElastiSearch
- query-builder - Sql Query Builder library
- soegen - Elasticsearch client for Crystal similar to the stretcher gem for ruby
Serverless Computing
- crystal_openfaas - Template to enable crystal as first class citizens in OpenFaaS
- gcf.cr - Managed execution of Crystal in Google Cloud Functions
- FaaStRuby - Serverless Software Development Platform for Ruby and Crystal.
- crystal_openfaas - Template to enable crystal as first class citizens in OpenFaaS
System
- baked_file_system - Virtual file system implementation
- hardware - Get CPU, Memory and Network informations of the running OS and its processes
Task management
- cake - Production-ready Make-like utility tool
- sam - Another one Rake-like task manager with namespacing and arguments system
Template Engine
- crinja - An implementation of the [Jinja2 template engine](http://jinja.pocoo.org/)
- crustache - [{{Mustache}}](https://mustache.github.io) for Crystal
- Jbuilder - Generate JSON objects with a Builder-style DSL, inspired by jbuilder
- Kilt - Abstraction layer for template engines
- Slang - Lightweight, terse, templating language inspired by Ruby's Slim
- teeplate - A library for rendering multiple template files
- ECR (Embedded Crystal) - compile time template language which uses plain crystal expressions (Crystal stdlib)
- ECR (Embedded Crystal) - compile time template language which uses plain crystal expressions (Crystal stdlib)
- ECR (Embedded Crystal) - compile time template language which uses plain crystal expressions (Crystal stdlib)
Testing
- crotest - A tiny and simple test framework
- crytic - Mutation testing framework
- LuckyFlow - Automated browser tests similar to Capybara
- mass-spec - Web API testing library
- microtest - Small opinionated testing library focusing on power asserts
- minitest.cr - Library for unit tests and assertions
- mocks.cr - Mocking library for Crystal
- spectator - Feature rich spec framework that uses the modern expect syntax
- timecop.cr - Library for mocking with `Time.now`. Inspired by the [timecop ruby gem](https://github.com/travisjeffery/timecop)
- vcr - A HTTP capture and replay implementation for crystal
- webdriver_pump - Page Object library. Inspired by Ruby's [WatirPump](https://github.com/bwilczek/watir_pump)
- webmock.cr - Library for stubbing `HTTP::Client` requests
- Spec - spec framework (Crystal stdlib)
- Spec - spec framework (Crystal stdlib)
- Spec - spec framework (Crystal stdlib)
Third-party APIs
- aws-credentials - Get AWS credentials in various ways
- aws-signer.cr - This library signs your HTTP requests using AWS v4
- awscr-s3 - AWS S3 interface
- awscr-signer - Sign HTTP::Request objects and generate presigned post forms
- bugsnag.cr - Bugsnag exception notifier and sidekiq middleware
- crystal-consul - Consul API client
- crystal-darksky - Wrapper for the [Dark Sky](https://darksky.net) API
- crystal-github - Wrapper for the [Github](https://github.com/) API
- crystal-swapi - Star Wars API (SWAPI) wrapper
- crystal_slack - A tool that parses Slack slash commands or send incoming web hooks
- GDAX - GDAX REST and WebSocket API Wrapper with request signing
- gitlab.cr - GitLab API wrapper
- google_maps_api - Google Maps API
- kube-client.cr - Kubernetes API Client
- mixpanel-crystal - A library for sending events to Mixpanel
- pinboard.cr - [Pinboard](https://pinboard.in) API
- raven.cr - Raven is a client for [Sentry](https://github.com/getsentry/sentry)
- twitter-crystal - A library to access the Twitter API
- ynab.cr - A library to interact with your YNAB data
- aws-credentials - Get AWS credentials in various ways
- discordcr - A minimalist Discord API library
Validation
- accord - Shareable validation library for Crystal Objects
- assert - Extensible annotation based object validation library
- denetmen - Micro check library that patches Crystal stdlib
- validations - Validations mixin
Web Frameworks
- amber - Open source efficient and cohesive web application framework
- athena - Modular, annotation based, API oriented framework with built in param conversion
- kemal - Lightning Fast, Super Simple web framework. Inspired by Sinatra
- lucky - Catch bugs early, forget about most performance issues, and spend more time on code instead of debugging and writing tests
- spider-gazelle - A Rails esque web framework with a focus on speed and extensibility
- grip - Class oriented fork of the Kemal framework based on a JSON request/response model
- athena - Modular, annotation based, API oriented framework with built in param conversion
Web Servers
- serve - Command line static HTTP server
- IRC - #crystal-lang on Freenode
- Google Group
- IRC - #crystal-lang on Freenode
- Reddit
- Stackoverflow
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
- IRC - #crystal-lang on Freenode
Unofficial
- Chinese-speaking Telegram Group - 来吧！TG 中文圈的朋友们！
- Russian-speaking Telegram Group - Добро пожаловать, товарищ!
- Crystal Mastery - Screencasts for learning Crystal
- devdocs.io - API Documentation Browser with Crystal support
- getgood.at - Learn Crystal in a Day
Official Documentation Translations
- br.crystal-lang.org - Brazilian
- kr.crystal-lang.org - Korean
- ru.crystal-lang.org - Russian
- tw.crystal-lang.org - Chinese Traditional
- carc.in - A web service that runs your code and displays the result
- crystalshards.herokuapp.com - Web services that list all available Crystal shards
- Crystular - Regular expression tester
- quicktype - Generate models and serializers from JSON, JSON Schema, GraphQL, and TypeScript
- wikicr - Wiki using git to manage revisions

Programming Languages

Crystal 295 Shell 3 Go 2 HTML 2 C++ 1 JavaScript 1 TypeScript 1

Ecosyste.ms: Awesome

awesome-crystal

Algorithms and Data structures

Api Builders

Blockchain

C bindings

Caching

CLI Builders

CLI Utils

Code Analysis and Metrics

Compression

Configuration

Converters

Cryptography

Data Formats

Data Generators

Database Drivers/Clients

Database Tools

Debugging

Dependency Injection

Development Tools

Email

Environment Management

Examples and funny stuff

Feature Flipping

Framework Components

Game Development

HTML Builders

HTML/XML Parsing

HTTP

Image processing

Implementations/Compilers

Logging and monitoring

Machine Learning

Markdown/Text Processors

Misc

Network Protocols

Networking

ORM/ODM Extensions

Package Management

Processes and Threads

Project Generators

Queues and Messaging

Routing

Scheduling

Science and Data analysis

Search

Serverless Computing

System

Task management

Template Engine

Testing

Third-party APIs

Validation

Web Frameworks

Web Servers

Unofficial

Official Documentation Translations