Crystal HacktoberFest

Open-source Crystal projects categorized as HacktoberFest

Top 17 Crystal HacktoberFest Projects

  • crystal

    The Crystal Programming Language

    Project mention: As a Go developer, I’m surprised Crystal isn’t more popular | | 2023-05-26

    There have been 7 releases in 2023 so far (, one of them (1.7.0) having over 30 different contributors.

  • Invidious

    Invidious is an alternative front-end to YouTube

    Project mention: Youtube is getting worse and worse... | | 2023-05-27

    I've been using for videos, and it actually is able to find accurate stuff instead of the pushed youtube crap lately.

  • SonarLint

    Clean code begins in your IDE with SonarLint. Up your coding game and discover issues early. SonarLint is a free plugin that helps you find & fix bugs and security issues from the moment you start writing code. Install from your favorite IDE marketplace today.

  • List-All-Programming-Telegram-Group

    List of All Programming Telegram Group

  • crest

    HTTP and REST client for Crystal (by mamantoha)

  • mosquito

    A background task runner for crystal applications supporting periodic (CRON) and manually queued jobs (by robacarp)

    Project mention: Background job processing with Marten and Mosquito | | 2023-04-09

    Marten is a web framework written in Crystal that makes building web applications easy and enjoyable. Mosquito is a background task runner for Crystal that uses Redis and that makes it easy to schedule and run tasks asynchronously.


    Evaluate JavaScript from Crystal!

  • Collision

    Check hashes for your files - A GUI tool to generate, compare and verify MD5, SHA-1, SHA-256 & SHA-512 hashes. (by GeopJr)

    Project mention: Collision: A GUI tool in Crystal to generate, compare and verify MD5, SHA-1, SHA-256 & SHA-512 hashes | | 2023-01-19
  • CodiumAI

    TestGPT | Generating meaningful tests for busy devs. Get non-trivial tests (and trivial, too!) suggested right inside your IDE, so you can code smart, create more value, and stay confident when you push.

  • spectator

    Feature-rich testing framework for Crystal inspired by RSpec. (by icy-arctic-fox)


    :clock3: Run periodic tasks in Crystal

  • crytic

    Mutation testing for crystal.


    Source code of

  • crinder

    Class based json renderer in Crystal

  • bitfields

    Bit Fields for Crystal Language

  • scar

    A game engine written in Crystal using crsfml

    Project mention: scar: A game engine written in Crystal | | 2023-04-13
  • HardWire

    A compile-time, non-intrusive dependency injection system.

  • lens

    A multiformat internationalization (i18n) shard for Crystal. (by syeopite)

  • crie

    Compile-time Trie in Crystal


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NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-05-27.

Crystal HacktoberFest related posts


What are some of the best open-source HacktoberFest projects in Crystal? This list will help you:

Project Stars
1 crystal 18,501
2 Invidious 10,010
3 List-All-Programming-Telegram-Group 1,163
4 crest 222
5 mosquito 196
6 135
7 Collision 107
8 spectator 90
9 72
10 crytic 60
11 36
12 crinder 28
13 bitfields 26
14 scar 24
15 HardWire 19
16 lens 16
17 crie 12
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