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https://github.com/eric-erki/awesome-crystal

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

List: awesome-crystal

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

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awesome-crystal

# Awesome Crystal
[![Awesome](https://awesome.re/badge.svg)](https://awesome.re)
[![Build Status](https://api.travis-ci.org/veelenga/awesome-crystal.svg)](https://travis-ci.org/veelenga/awesome-crystal)

A curated list of awesome Crystal code and resources. Inspired by [awesome](https://github.com/sindresorhus/awesome) and [awesome-awesomeness](https://github.com/bayandin/awesome-awesomeness).
The goal is to have projects mostly stable and useful for the community.

Search [Crystal Shards](https://crystalshards.xyz) or follow announcements [Crystal [ANN]](https://crystal-ann.com) for more.

Contributions are welcome. Please take a quick look at the [contribution guidelines](https://github.com/veelenga/awesome-crystal/blob/master/.github/CONTRIBUTING.md) first.

* [Awesome Crystal](#awesome-crystal)
* [Algorithms and Data structures](#algorithms-and-data-structures)
* [Api Builders](#api-builders)
* [Blockchain](#blockchain)
* [C Bindings](#c-bindings)
* [Caching](#caching)
* [CLI Builders](#cli-builders)
* [CLI Utils](#cli-utils)
* [Code Analysis and Metrics](#code-analysis-and-metrics)
* [Compression](#compression)
* [Configuration](#configuration)
* [Converters](#converters)
* [Cryptography](#cryptography)
* [Data Formats](#data-formats)
* [Data Generators](#data-generators)
* [Database Drivers/Clients](#database-driversclients)
* [Database Tools](#database-tools)
* [Debugging](#debugging)
* [Dependency Injection](#dependency-injection)
* [Development Tools](#development-tools)
* [Email](#email)
* [Environment Management](#environment-management)
* [Examples and funny stuff](#examples-and-funny-stuff)
* [Feature Flipping](#feature-flipping)
* [Framework Components](#framework-components)
* [Game Development](#game-development)
* [HTML Builders](#html-builders)
* [HTML/XML parsing](#htmlxml-parsing)
* [HTTP](#http)
* [Image Processing](#image-processing)
* [Implementations/Compilers](#implementationscompilers)
* [Logging and monitoring](#logging-and-monitoring)
* [Machine Learning](#machine-learning)
* [Markdown/Text Processors](#markdowntext-processors)
* [Misc](#misc)
* [Network Protocols](#network-protocols)
* [Networking](#networking)
* [ORM/ODM Extensions](#ormodm-extensions)
* [Package Management](#package-management)
* [Processes and Threads](#processes-and-threads)
* [Project Generators](#project-generators)
* [Queues and Messaging](#queues-and-messaging)
* [Routing](#routing)
* [Scheduling](#scheduling)
* [Science and Data analysis](#science-and-data-analysis)
* [Search](#search)
* [Serverless Computing](#serverless-computing)
* [System](#system)
* [Task management](#task-management)
* [Template Engine](#template-engine)
* [Testing](#testing)
* [Third-party APIs](#third-party-apis)
* [Validation](#validation)
* [Web Frameworks](#web-frameworks)
* [Web Servers](#web-servers)
* [Community](#community)
* [Unofficial](#unofficial)
* [Resources](#resources)
* [Official Documentation Translations](#official-documentation-translations)
* [Services and Apps](#services-and-apps)
* [Tools](#tools)
* [DevOps](#devops)
* [Editor Plugins](#editor-plugins)
* [Shell Plugins](#shell-plugins)

## Algorithms and Data structures
* [bisect](https://github.com/spider-gazelle/bisect) - Inserting values into a sorted array
* [crie](https://github.com/c910335/crie) - Compile-time Trie
* [CrOTP](https://github.com/philnash/crotp) - HOTP and TOTP implementation for two factor authentication
* [crystal-diff](https://github.com/MakeNowJust/crystal-diff) - A Crystal sequence differencing implementation
* [crystal-linked-list](https://github.com/abvdasker/crystal-linked-list) - Implementation of Linked List
* [crystaledge](https://github.com/unn4m3d/crystaledge) - A pure Vector Math library
* [crystalg](https://github.com/TobiasGSmollett/crystalg) - A Generic Algorithm Library
* [crystalline](https://github.com/jtomschroeder/crystalline) - A collection of containers and algorithms
* [edits.cr](https://github.com/tcrouch/edits.cr) - Collection of edit distance algorithms
* [graphlb](https://github.com/mettuaditya/graphlb) - Collection of graph datastructure and algorithms
* [hash_ring](https://github.com/TobiasGSmollett/hash_ring) - An Implementation of Consistent Hash Ring
* [haversine](https://github.com/geocrystal/haversine) - An Implementation of the Haversine formula
* [kd_tree](https://github.com/geocrystal/kd_tree) - An implementation of "K-Dimensional Tree" and "N-Nearest Neighbors"
* [ksuid.cr](https://github.com/Sija/ksuid.cr) - K-Sortable Globally Unique IDs
* [markov](https://github.com/mccallofthewild/markov) - Build Markov Chains and run Markov Processes
* [multiset.cr](https://github.com/tcrouch/multiset.cr) - Implementation of a multiset
* [oak](https://github.com/obsidian/oak) - A flexible Radix Tree implementation
* [radix](https://github.com/luislavena/radix) - Radix Tree implementation
* [ternary_search_tree](https://github.com/johnjansen/ternary_search_tree) - Ternary Search Tree

## Api Builders
* [kemal-rest-api](https://github.com/blocknotes/kemal-rest-api) - A library to create RESTful API with Kemal

## Blockchain
* [Cocol](https://github.com/cocol-project/cocol) - A minimal blockchain testbed
* [secp256k1.cr](https://github.com/q9f/secp256k1.cr) - Elliptic curve used in the public-private-key cryptography
* [SushiChain](https://github.com/SushiChain/SushiChain) - A custom blockchain platform

## C bindings
* [asound-cr](https://github.com/TamasSzekeres/asound-cr) - Bindings for ALSA/libasound
* [cairo-cr](https://github.com/TamasSzekeres/cairo-cr) - Bindings for [Cairo](https://cairographics.org/) graphics library
* [clang.cr](https://github.com/crystal-lang/clang.cr) - Libclang bindings
* [crt.cr](https://github.com/maiha/crt.cr) - Bindings for libncursesw and crt
* [crystal-gsl](https://github.com/ruivieira/crystal-gsl) - GNU Scientific Library bindings
* [crystal-hunspell](https://github.com/mamantoha/crystal-hunspell) - Bindings for [Hunspell](https://hunspell.github.io/)
* [curl-crystal](https://github.com/blocknotes/curl-crystal) - Bindings for [libcurl](https://curl.haxx.se/libcurl/)
* [duktape.cr](https://github.com/jessedoyle/duktape.cr) - Bindings for the [Duktape](https://github.com/svaarala/duktape) javascript engine
* [gphoto2.cr](https://github.com/Sija/gphoto2.cr) - Bindings for the [libgphoto2](http://www.gphoto.org/) library
* [icu.cr](https://github.com/olbat/icu.cr) - Bindings for the [ICU](http://site.icu-project.org/) library
* [libnotify.cr](https://github.com/splattael/libnotify.cr) - Bindings for Libnotify
* [pcap.cr](https://github.com/maiha/pcap.cr) - Bindings for libpcap
* [pledge.cr](https://github.com/chris-huxtable/pledge.cr) - Bindings for OpenBSD's `pledge(2)`
* [soundfile](https://github.com/mjago/soundfile) - Bindings for [libsndfile](http://www.mega-nerd.com/libsndfile/) library
* [ssh2.cr](https://github.com/spider-gazelle/ssh2.cr) - Bindings for libssh2 library
* [syslog.cr](https://github.com/chris-huxtable/syslog.cr) - Bindings for `syslog`
* [x11-cr](https://github.com/TamasSzekeres/x11-cr) - X11 bindings
* [x_do.cr](https://github.com/woodruffw/x_do.cr) - Bindings for libxdo ([`xdotool`](https://github.com/jordansissel/xdotool))

## Caching
* [bloom_filter](https://github.com/crystal-community/bloom_filter) - Implementation of Bloom filter
* [bojack](https://github.com/marceloboeira/bojack) - A non-reliable in-memory key-value store
* [crystal-memcached](https://github.com/comandeo/crystal-memcached) - Implementation of a memcached client
* [Nuummite](https://github.com/CodeSteak/Nuummite) - A tiny persistent embedded key-value store

## CLI Builders
* [admiral](https://github.com/jwaldrip/admiral.cr) - A robust DSL for writing command line interfaces
* [cli](https://github.com/mosop/cli) - Library for building command-line interface applications
* [clicr](https://github.com/j8r/clicr) - A simple declarative command line interface builder
* [clim](https://github.com/at-grandpa/clim) - Slim command line interface builder
* [commander](https://github.com/mrrooijen/commander) - Command-line interface builder
* [optarg](https://github.com/mosop/optarg) - Yet another library for parsing command-line options and arguments
* [OptionParser](https://crystal-lang.org/api/OptionParser.html) - command-line options processing (Crystal stdlib)
* [Phreak](https://github.com/shinzlet/phreak) - A highly flexible Crystal CLI builder in the style of OptionParser

## CLI Utils
* [cride](https://github.com/j8r/cride) - A light CLI text editor/IDE
* [oq](https://github.com/Blacksmoke16/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](https://github.com/TPei/progress_bar.cr) - A simple and customizable progress bar
* [tablo](https://github.com/hutou/tablo) - A flexible terminal table generator
* [tallboy](https://github.com/epoch/tallboy) - Generate ASCII character tables with support for spanning cells over multiple columns
* [terminal_table.cr](https://github.com/benoist/terminal_table.cr) - Simple ASCII table generator
* [terminimal](https://github.com/aca-labs/terminimal) - A tiny CLI toolkit for building terminal apps for humans
* [todo](https://git.sceptique.eu/Sceptique/todo) - Todo list working in command line

## Code Analysis and Metrics
* [ameba](https://github.com/crystal-ameba/ameba) - A static code analysis tool

## Compression
* [Crystar](https://github.com/naqvis/crystar) - Readers and writers of Tar archive format
* [Gzip](https://crystal-lang.org/api/Gzip.html) - readers and writers of gzip format (Crystal stdlib)
* [snappy](https://github.com/naqvis/snappy) - Snappy compression format reader/writer for Crystal
* [Zip](https://crystal-lang.org/api/Zip.html) - readers and writers of zip format (Crystal stdlib)
* [Zlib](https://crystal-lang.org/api/Zlib.html) - readers and writers of zlib format (Crystal stdlib)
* [zstd.cr](https://github.com/didactic-drunk/zstd.cr) - Bindings for [Zstandard](https://github.com/facebook/zstd) compression library

## Configuration
* [cr-dotenv](https://github.com/gdotdesign/cr-dotenv) - Loads .env file
* [envyable](https://github.com/philnash/envyable.cr) - A simple YAML to ENV config loader
* [habitat](https://github.com/luckyframework/habitat) - Type safe configuration for your classes and modules
* [totem](https://github.com/icyleaf/totem) - Load and parse a configuration in JSON, YAML, dotenv formats

## Converters
* [base62.cr](https://github.com/Sija/base62.cr) - Base62 encoder/decoder, well suited for url-shortening
* [money](https://github.com/crystal-money/money) - Handling money and currency conversion with ease (almost complete port of [RubyMoney](https://github.com/RubyMoney/money))
* [ms](https://github.com/SuperPaintman/ms) - Library to easily convert various time formats to milliseconds and milliseconds to human readable format
* [sass.cr](https://github.com/straight-shoota/sass.cr) - Compile SASS/SCSS to CSS ([libsass](https://github.com/sass/libsass/) binding)
* [time_format.cr](https://github.com/vladfaust/time_format.cr) - Convert time in human readable format with ease
* [turkish-number](https://github.com/izniburak/turkish-number) - Turn integers into the Turkish words
* [wkhtmltopdf-crystal](https://github.com/blocknotes/wkhtmltopdf-crystal) - Bindings / wrapper for libwkhtmltox (HTML to PDF / image converter)

## Cryptography
* [cmac](https://github.com/spider-gazelle/cmac) - Crystal implementation of Cipher-based Message Authentication Code (CMAC)
* [openssl.cr](https://github.com/z64/openssl.cr) - This library provides binding for OpenSSL library
* [sodium.cr](https://github.com/didactic-drunk/sodium.cr) - Crystal wrapper for the libsodium crypto API

## Data Formats
* [BinData](https://github.com/spider-gazelle/bindata) - Binary data parser helper with an [ASN.1](https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One) parser
* [config.cr](https://github.com/chris-huxtable/config.cr) - Easy to use configuration format parser
* [crinder](https://github.com/c910335/crinder) - Class based json renderer
* [CSV](https://crystal-lang.org/api/CSV.html) - parsing and generating for comma-separated values (Crystal stdlib)
* [front_matter.cr](https://github.com/chris-huxtable/front_matter.cr) - Separates a files front matter from its content
* [geoip2.cr](https://github.com/delef/geoip2.cr) - GeoIP2 reader
* [HAR](https://github.com/NeuraLegion/har) - HAR (HTTP Archive) parser
* [INI](https://crystal-lang.org/api/INI.html) - INI file parser (Crystal stdlib)
* [JSON](https://crystal-lang.org/api/JSON.html) - parsing and generating JSON documents (Crystal stdlib)
* [JSON tools](https://github.com/impatienttraveller/json-tools) - An implementation of JSON Patch and Pointer RFC's
* [JSON::OnSteroids](https://github.com/anykeyh/json_on_steroids) - handle and mutate JSON document easily
* [maxminddb.cr](https://github.com/delef/maxminddb.cr) - MaxMindDB reader
* [toml.cr](https://github.com/crystal-community/toml.cr) - TOML parser
* [XML](https://crystal-lang.org/api/XML.html) - parsing and generating XML documents (Crystal stdlib)
* [YAML](https://crystal-lang.org/api/YAML.html) - parsing and generating YAML documents (Crystal stdlib)

## Data Generators
* [faker](https://github.com/askn/faker) - A library for generating fake data
* [hashids.cr](https://github.com/splattael/hashids.cr) - A library to generate YouTube-like ids from one or many numbers

## Database Drivers/Clients
* [couchdb.cr](https://github.com/TechMagister/couchdb.cr) - CouchDB client
* [crystal-db](https://github.com/crystal-lang/crystal-db) - Common db api
* [crystal-mysql](https://github.com/crystal-lang/crystal-mysql) - MySQL connector for Crystal
* [crystal-pg](https://github.com/will/crystal-pg) - A Postgres driver
* [crystal-redis](https://github.com/stefanwille/crystal-redis) - Full featured Redis client
* [crystal-rethinkdb](https://github.com/kingsleyh/crystal-rethinkdb) - Driver for RethinkDB / RebirthDB
* [crystal-sqlite3](https://github.com/crystal-lang/crystal-sqlite3) - SQLite3 bindings
* [eventql-crystal](https://github.com/measurechina/eventql-crystal) - EventQL driver
* [leveldb](https://github.com/crystal-community/leveldb) - Crystal bindings for LevelDB
* [mongo.cr](https://github.com/ambercommunity/mongo.cr) - Binding for MongoDB C driver
* [rocksdb.cr](https://github.com/maiha/rocksdb.cr) - RocksDB client

## Database Tools
* [migrate](https://github.com/vladfaust/migrate.cr) - A simpler database migration tool with transactions
* [queryit](https://github.com/hugopl/queryit) - A setupless terminal based SQL query runner.

## Debugging
* [debug.cr](https://github.com/Sija/debug.cr) - `debug!(…)` macro for `pp`-style debugging

## Dependency Injection
* [Crystal-DI](https://github.com/funk-yourself/crystal-di) - Lightweight DI Container
* [syringe](https://github.com/Bonemind/syringe) - A simple and basic dependency injection shard for crystal

## Development Tools
* [kemal-watcher](https://github.com/faustinoaq/kemal-watcher) - Kemal plugin to watch files and live-reload the browser
* [sentry-run](https://github.com/faustinoaq/sentry-run) - Reload code changes using Sentry.run
* [Warden](https://github.com/diggersheep/warden) - Watches files, run command and a git command if succeed on file changes
* [watcher](https://github.com/faustinoaq/watcher) - Watch file changes using File.stat

## Email
* [carbon](https://github.com/luckyframework/carbon) - Fun, testable, and adapter-based email library
* [crystal-email](https://github.com/arcage/crystal-email) - Simple e-mail sending library
* [CrystalEmail](https://git.sceptique.eu/Sceptique/CrystalEmail) - A RFC compliant Email validator
* [sendgrid.cr](https://github.com/dlanileonardo/sendgrid.cr) - Simple Sendgrid Client

## Environment Management
* [asdf-crystal](https://github.com/marciogm/asdf-crystal) - Plugin for asdf version manager
* [crenv](https://github.com/pine/crenv) - Crystal version manager
* [rcm.cr](https://github.com/maiha/rcm.cr) - Redis Cluster Manager

## Examples and funny stuff
* [blackjack-cr](https://github.com/gdonald/blackjack-cr) - Console Blackjack
* [clamp](https://github.com/johnjansen/clamp) - Clamp any Comparable
* [crystal-patterns](https://github.com/crystal-community/crystal-patterns) - Examples of GOF patters
* [crystalworld](https://github.com/vladfaust/crystalworld) - [realworld.io](https://realworld.io) back-end API implementation
* [exercism-crystal](https://github.com/exercism/crystal) - Exercism exercises
* [try.cr](https://github.com/maiha/try.cr) - Try monad

## Feature Flipping
* [can_use](https://github.com/rodrigopinto/can_use) - It is a minimalist feature toggle/flag for crystal based on yaml
* [flipper](https://github.com/metaware/flipper) - Feature flipping/flags/rollouts. Supports multiple backends

## Framework Components
* [device_detector](https://github.com/creadone/device_detector) - Shard for detect device by user agent string
* [Exception Page](https://github.com/crystal-loot/exception_page) - An exceptional exception page for Crystal web libraries and frameworks
* [graphql-crystal](https://github.com/ziprandom/graphql-crystal) - [Graphql](http://graphql.org) implementation
* [kave](https://github.com/jwoertink/kave) - Kemal API Version Extension
* [kemal-session](https://github.com/kemalcr/kemal-session) - Session handler for Kemal
* [multi-auth](https://github.com/msa7/multi_auth) - Standardized multi-provider OAuth2 authentication (inspired by omniauth)
* [praetorian](https://github.com/ilanusse/praetorian) - Minimalist authorization library inspired by Pundit
* [request_id](https://github.com/SuperPaintman/request-id) - Middleware for generates / pick up a unique request ID for Crystal servers
* [response_time](https://github.com/SuperPaintman/response-time) - Response time for Crystal servers (pure http server, kemal, etc.)
* [shrine.cr](https://github.com/jetrockets/shrine.cr) - File Attachment toolkit for Crystal applications. Heavily inspired by Shrine for Ruby
* [tourmaline](https://github.com/watzon/tourmaline) - Telegram bot framework with an API loosely based on [telegraf.js](https://telegraf.js.org/)

## Game Development
* [CrSFML](https://github.com/oprypin/crsfml) - Bindings to [SFML](https://www.sfml-dev.org/) multimedia/game library
* [crystal-chipmunk](https://github.com/oprypin/crystal-chipmunk) - Bindings for [Chipmunk](http://chipmunk-physics.net/), a fast and lightweight 2D game physics library
* [glove](https://github.com/ddfreyne/glove) - A library for gaming development

## HTML Builders
* [form_builder.cr](https://github.com/westonganger/form_builder.cr) - Dead simple HTML form builder for Crystal with built-in support for many popular UI libraries such as Bootstrap
* [html_builder](https://github.com/crystal-lang/html_builder) - DSL for creating HTML

## HTML/XML Parsing
* [gumbo-crystal](https://github.com/blocknotes/gumbo-crystal) - Bindings for [Gumbo](https://github.com/google/gumbo-parser), an HTML5 parsing library made by Google
* [hq.cr](https://github.com/maiha/hq.cr) - Simple wrapper for crystal-xml
* [myhtml](https://github.com/kostya/myhtml) - Fast HTML5 Parser that includes CSS selectors

## HTTP
* [Cable](https://github.com/cable-cr/cable) - An ActionCable "port" to Crystal, framework agnostic, 100% compatible with the ActionCable JS Client
* [cossack](https://github.com/crystal-community/cossack) - Simple flexible HTTP client
* [crest](https://github.com/mamantoha/crest) - Simple HTTP and REST client, inspired by the Ruby's RestClient gem
* [crul](https://github.com/porras/crul) - Command line HTTP client
* [cryload](https://github.com/sdogruyol/cryload) - HTTP benchmarking tool
* [halite](https://github.com/icyleaf/halite) - Crystal HTTP Requests with a chainable REST API, built-in sessions and loggers
* [helmet](https://github.com/EvanHahn/crystal-helmet) - Set security-related HTTP headers
* [http-multiserver.cr](https://github.com/vladfaust/http-multiserver.cr) - Mounting multiple servers via routes (a.k.a. URL mapping)
* [http-params-serializable](https://github.com/vladfaust/http-params-serializable) - HTTP params (de)serialization, applicable to URL queries and URL-encoded forms
* [http-protection](https://github.com/rogeriozambon/http-protection) - Protection against typical web attacks
* [http2](https://github.com/ysbaddaden/http2) - HTTP/2 Protocol Implementation
* [HTTP::Client](https://crystal-lang.org/api/HTTP/Client.html) - HTTP client (Crystal stdlib)
* [HTTP::Server](https://crystal-lang.org/api/HTTP/Server.html) - HTTP server (Crystal stdlib)
* [HTTP::WebSocket](https://crystal-lang.org/api/HTTP/WebSocket.html) - HTTP WebSocket client (Crystal stdlib)
* [keyer_cr](https://github.com/danielpclark/keyer_cr) - Adds HTTP GET/POST parameter parsing as a Hash-like object
* [proxy-fetcher.cr](https://github.com/nbulaj/proxy-fetcher.cr) - Proxy lists fetching & validating library
* [resp-crystal](https://github.com/soveran/resp-crystal) - Lightweight RESP client
* [sse.cr](https://github.com/y2k2mt/sse.cr) - [Server-Sent Events](https://www.w3.org/TR/2009/WD-eventsource-20090421) client

## Image processing
* [libpixel.cr](https://github.com/libpixel/libpixel.cr)
* [magickwand-crystal](https://github.com/blocknotes/magickwand-crystal) - Bindings for [MagickWand](https://www.imagemagick.org/script/magick-wand.php), the C interface for ImageMagick processing libraries
* [stumpy_png](https://github.com/stumpycr/stumpy_png) - Read and write PNG images

## Implementations/Compilers
* [charly](https://github.com/charly-lang) - Charly Programming Language
* [cltk](https://github.com/ziprandom/cltk) - A crystal port of the Ruby Language Toolkit
* [cppize](https://github.com/unn4m3d/cppize) - Crystal-to-C++ transpiler
* [crisp](https://github.com/rhysd/Crisp) - Lisp dialect implemented with Crystal
* [crow](https://github.com/geppetto-apps/crow) - Transpile/compile Crystal to [Flow](https://flow.org/)
* [LinCAS-lang](https://github.com/LinCAS-lang) - A programming language for scientific computation
* [mint-lang](https://github.com/mint-lang/mint) - A refreshing programming language for the front-end web
* [myst-lang](https://github.com/myst-lang/) - A practical, dynamic language designed to be written and understood as easily and efficiently as possible
* [runic-lang](https://github.com/runic-lang) - In-design toy language

## Logging and monitoring
* [crafana](https://github.com/spoved/crafana.cr) - A [Grafana](https://grafana.com/) library to help autogenerate dashboards
* [crometheus](https://gitlab.com/ezrast/crometheus) - A [Prometheus](https://prometheus.io/) client library
* [crylog](https://github.com/blacksmoke16/crylog) - Flexible logging framework based on Monolog
* [fluent-logger-crystal](https://github.com/TobiasGSmollett/fluent-logger-crystal) - A structured logger for [Fluentd](https://www.fluentd.org/)
* [Logger](https://crystal-lang.org/api/Logger.html) - logging utility (Crystal stdlib)
* [statsd.cr](https://github.com/miketheman/statsd.cr) - [Statsd](https://github.com/etsy/statsd) client library
* [syslog.cr](https://github.com/comandeo/syslog.cr) - Implementation of Syslog client

## Machine Learning
* [ai4cr](https://github.com/drhuffman12/ai4cr) - Artificial Intelligence (based on https://github.com/SergioFierens/ai4r)
* [Cadmium](https://github.com/cadmiumcr/cadmium) - NLP library based heavily on [natural](https://github.com/NaturalNode/natural)
* [crystal-fann](https://github.com/NeuraLegion/crystal-fann) - FANN (Fast Artifical Neural Network) binding
* [shainet](https://github.com/NeuraLegion/shainet) - SHAInet (Neural Network in pure crystal)
* [tensorflow.cr](https://github.com/fazibear/tensorflow.cr) - Bindings for [TensorFlow](https://github.com/tensorflow/tensorflow)

## Markdown/Text Processors
* [html-pipeline](https://github.com/huacnlee/html-pipeline) - HTML processing filters and utilities
* [markd](https://github.com/icyleaf/markd) - Yet another markdown parser built for speed, Compliant to CommonMark specification

## Misc
* [aasm.cr](https://github.com/veelenga/aasm.cr) - Easy to use finite state machine for Crystal classes
* [any_hash.cr](https://github.com/Sija/any_hash.cr) - Recursive Hash with better JSON::Any included
* [atomic_write.cr](https://github.com/chris-huxtable/atomic_write.cr) - Library for writing or apppending files atomically
* [burocracia.cr](https://github.com/vnbrs/burocracia.cr) - burocracia.cr the dependecyless shard to validate, generate and format Brazilian burocracias such as CPF, CNPJ and CEP
* [callbacks](https://github.com/vladfaust/callbacks.cr) - Expressive callbacks module
* [circuit_breaker](https://github.com/TPei/circuit_breaker) - Implementation of the circuit breaker pattern
* [containerregistry.cr](https://github.com/naqvis/containerregistry.cr) - Library for working with container registries
* [CrSerializer](https://github.com/blacksmoke16/CrSerializer) - Extensible annotation based serialization/deserialization library
* [CrSignals](https://github.com/firejox/CrSignals) - Signals/slots notification library
* [crystal-binary_parser](https://github.com/DanSnow/crystal-binary_parser) - Binary parser
* [crystal-web-framework-stars](https://github.com/isaced/crystal-web-framework-stars) - Web frameworks for Crystal, most starred on Github
* [crz](https://github.com/dhruvrajvanshi/crz) - Functional programming library
* [emoji.cr](https://github.com/veelenga/emoji.cr) - Emoji library
* [hoop](https://github.com/0x73/hoop) - Building native OSX apps
* [i18n.cr](https://github.com/vladfaust/i18n.cr) - Internationalization shard
* [immutable](https://github.com/lucaong/immutable) - Implementation of thread-safe, persistent, immutable collections
* [inflector.cr](https://github.com/phoffer/inflector.cr) - Singularize, pluralize, camelize, etc (port from ActiveSupport)
* [lirith](https://github.com/lirith-engine/lirith) - Graphics engine
* [m3u8](https://github.com/akiicat/m3u8) - Generate and parse m3u8 playlists for HTTP Live Streaming
* [message_verifier.cr](https://github.com/danielwestendorf/message_verifier.cr) - Verify and generate Rails `ActiveSupport::MessageVerifier` signed tokens
* [monads](https://github.com/alex-lairan/monads) - Monad implementation
* [pangu.cr](https://github.com/isaced/pangu.cr) - Paranoid text spacing in Crystal
* [pinger](https://github.com/spider-gazelle/pinger) - Ping IP addresses and DNS entries without requiring sudo
* [port_midi](https://github.com/jimm/crystal_port_midi) - Crystal C bindings for the PortMIDI cross-platform MIDI I/O library
* [retriable.cr](https://github.com/Sija/retriable.cr) - Simple DSL to retry failed code blocks
* [tren](https://github.com/sdogruyol/tren) - Give your SQL some love
* [ulid](https://github.com/SuperPaintman/ulid) - Universally Unique Lexicographically Sortable Identifier (ULID)
* [zaru_crystal](https://github.com/szTheory/zaru_crystal) - Filename sanitization

## Network Protocols
* [bson.cr](https://github.com/jeromegn/bson.cr) - Native BSON implementation
* [connect-proxy](https://github.com/spider-gazelle/connect-proxy) - Connect method style of HTTP tunnelling / HTTP proxy
* [cr-xmpp](https://github.com/naqvis/cr-xmpp) - XMPP/Jabber Library
* [Crirc](https://github.com/Meoowww/Crirc) - IRC protocol implementation (Client, Server, Bots)
* [crystal-json-socket](https://github.com/foi/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](https://github.com/spider-gazelle/crystal-snmp) - An SNMP implementation with version 1, 2c and 3 support
* [fast_irc.cr](https://github.com/RX14/fast_irc.cr) - Fast IRC parser/generator
* [gopher.cr](https://github.com/anicholson/gopher.cr) - Gopher server toolkit
* [jwt](https://github.com/crystal-community/jwt) - Implementation of JWT (JSON Web Token)
* [msgpack-crystal](https://github.com/crystal-community/msgpack-crystal) - MessagePack library
* [OAuth](https://crystal-lang.org/api/OAuth.html) - OAuth consumer (Crystal stdlib)
* [OAuth2](https://crystal-lang.org/api/OAuth2.html) - OAuth2 client (Crystal stdlib)
* [OpenSSL](https://crystal-lang.org/api/OpenSSL.html) - bindings to libssl (Crystal stdlib)
* [telnet.cr](https://github.com/spider-gazelle/telnet.cr) - Telnet protocol
* [transfer_more](https://git.sceptique.eu/Sceptique/transfer_more) - Clone of transfer.sh to uploads files

## Networking
* [ipaddress.cr](https://github.com/Sija/ipaddress.cr) - Library to handle IPv4 and IPv6 addresses

## ORM/ODM Extensions
* [avram](https://github.com/luckyframework/avram) - A database wrapper for reading, writing, and migrating Postgres databases.
* [clear](https://github.com/anykeyh/clear) - ORM specialized to PostgreSQL only but with advanced features
* [crecto](https://github.com/Crecto/crecto) - Database wrapper, based on Ecto
* [granite](https://github.com/amberframework/granite) - ORM for Postgres, Mysql, Sqlite
* [jennifer.cr](https://github.com/imdrasil/jennifer.cr) - Active Record pattern implementation with flexible query chainable builder and migration system
* [ohm-crystal](https://github.com/soveran/ohm-crystal) - Object-hash mapping library for Redis
* [onyx-sql](https://github.com/onyxframework/sql) - DB-agnostic SQL ORM with beautiful DSL and type-safe Query builder
* [redis-tsv.cr](https://github.com/maiha/redis-tsv.cr) - Import and export data from Redis in TSV format
* [rethinkdb-orm](https://github.com/spider-gazelle/rethinkdb-orm) - ORM for RethinkDB / RebirthDB
* [stal-crystal](https://github.com/soveran/stal-crystal) - Set algebra solver for Redis
* [topaz](https://github.com/topaz-crystal/topaz) - A simple and useful db wrapper

## Package Management
* [shards](https://github.com/crystal-lang/shards) - Dependency manager for the Crystal

## Processes and Threads
* [await_async](https://github.com/anykeyh/await_async) - Add keywords await & async in Crystal Lang
* [crystal-futures](https://github.com/dhruvrajvanshi/crystal-futures) - Future type implementation
* [neph](https://github.com/tbrand/neph) - A modern command line job processor that can execute jobs concurrently
* [promise](https://github.com/spider-gazelle/promise) - A Promise implementation with type inference

## Project Generators
* [crystal_lib](https://github.com/crystal-lang/crystal_lib) - Automatic binding generator for native libraries
* [fez](https://github.com/jwoertink/fez) - A Kemal application generator
* [kgen](https://github.com/kemalyst/kemalyst-generator) - Kemalyst command line tool for console, init, generate (scaffolding), and watch.
* [libgen](https://github.com/olbat/libgen) - Automatic bindings generator configured using JSON/YAML files
* [wasp](https://github.com/icyleaf/wasp) - Static Site Generator

## Queues and Messaging
* [dispatch](https://github.com/bmulvihill/dispatch) - In memory asynchronous job processing
* [mosquito](https://github.com/robacarp/mosquito/) - Redis backed periodic and ad hoc job processing
* [NATS.io](https://github.com/nats-io/nats.cr) - NATS client
* [sidekiq.cr](https://github.com/mperham/sidekiq.cr) - Simple, efficient job processing

## Routing
* [orion](https://github.com/obsidian/orion) - A minimal, rails-esque routing library
* [router.cr](https://github.com/tbrand/router.cr) - Minimum but powerful http router for HTTP::Server
* [toro](https://github.com/soveran/toro) - Tree Oriented Routing

## Scheduling
* [crystime](https://gitlab.com/crystallabs/crystime) - Advanced time, calendar, schedule, and remind library
* [schedule.cr](https://github.com/hugoabonizio/schedule.cr) - Run periodic tasks
* [tasker](https://github.com/spider-gazelle/tasker) - A high precision scheduler including timezone aware cron jobs

## Science and Data analysis
* [linalg](https://github.com/konovod/linalg) - Linear algebra library inspired by MATLAB and SciPy.linalg
* [num.cr](https://github.com/crystal-data/num.cr) - Numerical computing library supporting N-Dimensional data
* [predict.cr](https://github.com/RX14/predict.cr) - Satellite prediction library using the sgp4 model
* [stats](https://git.sceptique.eu/Sceptique/stats) - An expressive implementation of statistical distributions

## Search
* [hermes](https://github.com/imdrasil/hermes.cr) - Data Mapper pattern implementation for ElastiSearch
* [query-builder](https://github.com/izniburak/query-builder) - Sql Query Builder library
* [soegen](https://github.com/Ragmaanir/soegen) - Elasticsearch client for Crystal similar to the stretcher gem for ruby

## Serverless Computing
* [crystal_openfaas](https://github.com/TPei/crystal_openfaas/) - Template to enable crystal as first class citizens in OpenFaaS
* [FaaStRuby](https://faastruby.io) - Serverless Software Development Platform for Ruby and Crystal.
* [gcf.cr](https://github.com/sam0x17/gcf.cr) - Managed execution of Crystal in Google Cloud Functions

## System
* [baked_file_system](https://github.com/schovi/baked_file_system) - Virtual file system implementation
* [hardware](https://github.com/crystal-community/hardware) - Get CPU, Memory and Network informations of the running OS and its processes

## Task management
* [cake](https://github.com/axvm/cake) - Production-ready Make-like utility tool
* [sam](https://github.com/imdrasil/sam.cr) - Another one Rake-like task manager with namespacing and arguments system

## Template Engine
* [crinja](https://github.com/straight-shoota/crinja) - An implementation of the [Jinja2 template engine](http://jinja.pocoo.org/)
* [crustache](https://github.com/MakeNowJust/crustache) - [{{Mustache}}](https://mustache.github.io) for Crystal
* [ECR (Embedded Crystal)](https://crystal-lang.org/api/ECR.html) - compile time template language which uses plain crystal expressions (Crystal stdlib)
* [Jbuilder](https://github.com/shootingfly/jbuilder) - Generate JSON objects with a Builder-style DSL, inspired by jbuilder
* [Kilt](https://github.com/jeromegn/kilt) - Abstraction layer for template engines
* [Slang](https://github.com/jeromegn/slang) - Lightweight, terse, templating language inspired by Ruby's Slim
* [teeplate](https://github.com/mosop/teeplate) - A library for rendering multiple template files

## Testing
* [crotest](https://github.com/emancu/crotest) - A tiny and simple test framework
* [crytic](https://github.com/hanneskaeufler/crytic) - Mutation testing framework
* [LuckyFlow](https://github.com/luckyframework/lucky_flow) - Automated browser tests similar to Capybara
* [mass-spec](https://github.com/c910335/mass-spec) - Web API testing library
* [microtest](https://github.com/Ragmaanir/microtest) - Small opinionated testing library focusing on power asserts
* [minitest.cr](https://github.com/ysbaddaden/minitest.cr) - Library for unit tests and assertions
* [mocks.cr](https://github.com/waterlink/mocks.cr) - Mocking library for Crystal
* [Spec](https://crystal-lang.org/api/Spec.html) - spec framework (Crystal stdlib)
* [spectator](https://gitlab.com/arctic-fox/spectator) - Feature rich spec framework that uses the modern expect syntax
* [timecop.cr](https://github.com/crystal-community/timecop.cr) - Library for mocking with `Time.now`. Inspired by the [timecop ruby gem](https://github.com/travisjeffery/timecop)
* [vcr](https://github.com/spoved/vcr.cr) - A HTTP capture and replay implementation for crystal
* [webdriver_pump](https://github.com/bwilczek/webdriver_pump) - Page Object library. Inspired by Ruby's [WatirPump](https://github.com/bwilczek/watir_pump)
* [webmock.cr](https://github.com/manastech/webmock.cr) - Library for stubbing `HTTP::Client` requests

## Third-party APIs
* [aws-credentials](https://github.com/y2k2mt/aws-credentials) - Get AWS credentials in various ways
* [aws-signer.cr](https://github.com/beanieboi/aws-signer.cr) - This library signs your HTTP requests using AWS v4
* [awscr-s3](https://github.com/taylorfinnell/awscr-s3) - AWS S3 interface
* [awscr-signer](https://github.com/taylorfinnell/awscr-signer) - Sign HTTP::Request objects and generate presigned post forms
* [bugsnag.cr](https://github.com/gewo/bugsnag.cr) - Bugsnag exception notifier and sidekiq middleware
* [crystal-consul](https://github.com/rogerwelin/crystal-consul) - Consul API client
* [crystal-darksky](https://github.com/sb89/crystal-darksky) - Wrapper for the [Dark Sky](https://darksky.net) API
* [crystal-github](https://github.com/felipeelias/crystal-github) - Wrapper for the [Github](https://github.com/) API
* [crystal-swapi](https://github.com/sb89/crystal-swapi) - Star Wars API (SWAPI) wrapper
* [crystal_slack](https://github.com/manastech/crystal_slack) - A tool that parses Slack slash commands or send incoming web hooks
* [discordcr](https://github.com/meew0/discordcr) - A minimalist Discord API library
* [GDAX](https://github.com/mccallofthewild/gdax) - GDAX REST and WebSocket API Wrapper with request signing
* [gitlab.cr](https://github.com/icyleaf/gitlab.cr) - GitLab API wrapper
* [google_maps_api](https://github.com/fridgerator/google_maps_api) - Google Maps API
* [kube-client.cr](https://github.com/spoved/kube-client.cr) - Kubernetes API Client
* [mixpanel-crystal](https://github.com/petoem/mixpanel-crystal) - A library for sending events to Mixpanel
* [pinboard.cr](https://github.com/oz/pinboard.cr) - [Pinboard](https://pinboard.in) API
* [raven.cr](https://github.com/sija/raven.cr) - Raven is a client for [Sentry](https://github.com/getsentry/sentry)
* [twitter-crystal](https://github.com/sferik/twitter-crystal) - A library to access the Twitter API
* [ynab.cr](https://github.com/jaredsmithse/ynab.cr) - A library to interact with your YNAB data

## Validation
* [accord](https://github.com/neovintage/accord) - Shareable validation library for Crystal Objects
* [assert](https://github.com/blacksmoke16/assert) - Extensible annotation based object validation library
* [denetmen](https://github.com/izniburak/denetmen) - Micro check library that patches Crystal stdlib
* [validations](https://github.com/vladfaust/validations.cr) - Validations mixin

## Web Frameworks
* [amber](https://github.com/amberframework/amber) - Open source efficient and cohesive web application framework
* [athena](https://github.com/blacksmoke16/athena) - Modular, annotation based, API oriented framework with built in param conversion
* [grip](https://github.com/grkek/grip) - Class oriented fork of the Kemal framework based on a JSON request/response model
* [kemal](https://github.com/kemalcr/kemal) - Lightning Fast, Super Simple web framework. Inspired by Sinatra
* [lucky](https://github.com/luckyframework/lucky) - Catch bugs early, forget about most performance issues, and spend more time on code instead of debugging and writing tests
* [spider-gazelle](https://github.com/spider-gazelle/spider-gazelle) - A Rails esque web framework with a focus on speed and extensibility

## Web Servers
* [serve](https://github.com/SuperPaintman/serve) - Command line static HTTP server

# Community
* [Crystal weekly newsletters](http://crystalweekly.com/)
* [Gitter](https://gitter.im/crystal-lang/crystal)
* [Google Group](https://groups.google.com/forum/?fromgroups#!forum/crystal-lang)
* [IRC](http://irc.lc/freenode/crystal-lang) - #crystal-lang on Freenode
* [Metaruby](https://metaruby.com/c/crystal-forum) - Crystal Forum on Metaruby
* [Reddit](https://www.reddit.com/r/crystal_programming/)
* [Stackoverflow](https://stackoverflow.com/tags/crystal-lang/info)

## Unofficial
* [Chinese-speaking Telegram Group](https://t.me/crystal_cn) - 来吧!TG 中文圈的朋友们!
* [Crystal Programming Discord Server](https://discord.gg/YS7YvQy) - Unofficial Discord server dedicated to the Crystal Programming Language
* [Russian-speaking Telegram Group](https://t.me/crystal_ru) - Добро пожаловать, товарищ!

# Resources
* [Crystal for Rubyists](http://www.crystalforrubyists.com/) - Free book to bootstrap your Crystal journey
* [Crystal Mastery](https://crystalmastery.io/) - Screencasts for learning Crystal
* [crystal-lang.org](https://crystal-lang.org) - Official language site
* [devdocs.io](https://devdocs.io/crystal/) - API Documentation Browser with Crystal support
* [getgood.at](https://getgood.at/in-a-day/crystal) - Learn Crystal in a Day
* [Programming Crystal](https://pragprog.com/book/crystal/programming-crystal) - PragProg book to start your Crystal journey

## Official Documentation Translations
* [br.crystal-lang.org](http://br.crystal-lang.org/) - Brazilian
* [ja.crystal-lang.org](http://ja.crystal-lang.org/) - Japanese
* [kr.crystal-lang.org](https://kr.crystal-lang.org/) - Korean
* [ru.crystal-lang.org](http://ru.crystal-lang.org/) - Russian
* [tw.crystal-lang.org](http://tw.crystal-lang.org/) - Chinese Traditional

# Services and Apps
* [carc.in](https://carc.in/) - A web service that runs your code and displays the result
* [cry](https://github.com/elorest/cry) - Ability to execute crystal code in a fashion similar to Ruby's pry edit
* [Crystal [ANN]](https://crystal-ann.com) - Announce new project, blog post, version update or any other Crystal work
* [crystalshards.herokuapp.com](https://crystalshards.herokuapp.com/), [crystalshards.xyz](http://crystalshards.xyz/) - Web services that list all available Crystal shards
* [Crystular](http://www.crystular.org) - Regular expression tester
* [DeBot](https://github.com/jhass/DeBot) - IRC bot written in Crystal
* [Fluence](https://github.com/docelic/fluence) - WYSIWYG wiki using markdown and Git
* [icr](https://github.com/crystal-community/icr) - Interactive console for Crystal (like IRB for Ruby)
* [Invidious](https://github.com/omarroth/invidious) - Invidious is an alternative front-end to YouTube
* [mpngin](https://github.com/thewalkingtoast/mpngin) - A URL shortener with simple stats
* [quicktype](https://quicktype.io/) - Generate models and serializers from JSON, JSON Schema, GraphQL, and TypeScript
* [shards.info](http://shards.info/) - Web service that lists all repositories on GitHub that have Crystal code in them. The sources are available on [GitHub](https://github.com/mamantoha/shards-info)
* [wikicr](https://git.sceptique.eu/Sceptique/wikicr) - Wiki using git to manage revisions

# Tools
* [ast_helper](https://github.com/bcardiff/crystal-ast-helper) - Helper tool to debug parser and formatter
* [crystal-base](https://github.com/ruivieira/crystal-base) - CentOS base docker image for Crystal development
* [crystal-ctags](https://github.com/SuperPaintman/crystal-ctags) - Ctags generator for Crystal
* [crystal-dash-docset](https://github.com/Sija/crystal-dash-docset) - [Dash](https://kapeli.com/dash) docset generator

## DevOps
* [ansible-crystal](https://github.com/CorbanR/ansible-crystal) - Ansible playbook for installing crystal
* [crystal-cookbook](https://github.com/vjdhama/crystal-cookbook) - Chef cookbook for installing crystal
* [DPPM](https://github.com/DFabric/dppm) - An easy, universal way to install and manage applications as packages (mostly Linux)

## Editor Plugins
* Atom
* [crystal-tools](https://atom.io/packages/crystal-tools) - Enables built in tools in Crystal compiler
* [language-crystal-actual](https://atom.io/packages/language-crystal-actual) - Crystal language support in Atom
* Emacs
* [emacs-crystal-mode](https://github.com/dotmilk/emacs-crystal-mode) - Crystal language support for Emacs
* [play-crystal.el](https://github.com/veelenga/play-crystal.el) - [play.crystal-lang.org](https://play.crystal-lang.org/#/cr) integration in Emacs
* [scry](https://github.com/crystal-lang-tools/scry) - Code analysis server for Crystal implementing the [Language Server Protocol](https://microsoft.github.io/language-server-protocol/)
* Spacemacs
* [crystal-spacemacs-layer](https://github.com/juanedi/crystal-spacemacs-layer) - Spacemacs contribution layer for Crystal
* Sublime
* [sublime-crystal](https://github.com/crystal-lang-tools/sublime-crystal) - Crystal syntax highlighting for sublime Text
* TextMate
* [Crystal.tmbundle](https://github.com/crystal-lang-tools/Crystal.tmbundle) - Crystal syntax highlighting, compile, format command, snippets
* Vim
* [vim-crystal](https://github.com/rhysd/vim-crystal) - Vim filetype support for Crystal
* [vim-slang](https://github.com/elorest/vim-slang) - Vim filetype support for Slang Templating Engine
* Visual Studio Code
* [vscode-crystal](https://github.com/g3ortega/vscode-crystal) - Crystal language support in VSCode
* [vscode-crystal-ide](https://github.com/crystal-lang-tools/crystal-ide) - Crystal IDE powered by [Language Server Protocol](https://code.visualstudio.com/blogs/2016/06/27/common-language-protocol)
* [vscode-crystal-lang](https://github.com/crystal-lang-tools/vscode-crystal-lang) - Formatter, linter and syntax highlighting for `cr` and `ecr` files

## Shell plugins
* [crun](https://github.com/Val/crun) - Crystal Run : shebang wrapper for Crystal
* [crystal-zsh](https://github.com/veelenga/crystal-zsh) - .oh-my-zsh plugin