Welcoming Repositories Index Crystal Ecosystem
Top Welcoming Open-Source Crystal Repositories
Top welcoming Crystal repositories. Scored by real 90-day external PR merge rates, maintainer review turnaround speed, and first-time contributor success.
Updated daily • Sun, 30 Aug 2026 UTC
Tracked Repos
48
>100 stars verified
Avg Merge Rate
14%
90-day external PRs
Open GFIs
0
Beginner friendly issues
Welcoming Tier
3
S & A Tier maintainers
Ranked Crystal Repositories
Showing top 48 of 48 ranked repositories
| Rank | Repository | Tier | Score | Merge Rate | Good First Issues |
|---|---|---|---|---|---|
| #1 | kemalcr/kemal3,904 Fast, Effective, Simple Web Framework | S•Elite | 78.8 | 100.0% | - |
| #2 | owasp-noir/noir1,373 Hunt every Endpoint in your code, expose Shadow APIs, map the Attack Surface. | B•Solid | 73.0 | 99.0% | - |
| #3 | cloudamqp/lavinmq1,000 Ultra quick message queue and streaming server | A•Welcoming | 61.9 | 65.4% | - |
| #4 | crystal-lang/crystal20,372 The Crystal Programming Language | A•Welcoming | 59.2 | 70.2% | - |
| #5 | 🏴☠️ Find dead-links (broken links) | B•Solid | 57.0 | 100.0% | - |
| #6 | Common db api for crystal | B•Solid | 50.6 | 100.0% | - |
| #7 | iv-org/invidious22,675 Invidious is an alternative front-end to YouTube | B•Solid | 47.2 | 23.1% | - |
| #8 | An ecosystem of reusable, independent components | B•Solid | 44.6 | 52.0% | - |
| #9 | ActivityPub (https://www.w3.org/TR/activitypub/) server for individual users and small groups. | C•Moderate | 32.8 | 41.2% | - |
| #10 | HTTP/2 Protocol Implementation for the Crystal Language | D•Risky | 28.8 | 0.0% | - |
| #11 | Console / terminal GUI toolkit for Crystal. | D•Risky | 8.0 | 0.0% | - |
| #12 | List of All Programming Telegram Group | D•Risky | 0.0 | 0.0% | - |
| #13 | copy pasting in terminal with vimium/vimperator like hints. | D•Risky | 0.0 | 0.0% | - |
| #14 | Downloads the latest "nightly" build/artifact from a continuous testing workflow | D•Risky | 0.0 | 0.0% | - |
| #15 | Dependency manager for the Crystal language | D•Risky | 0.0 | 0.0% | - |
| #16 | A static code analysis tool for Crystal | D•Risky | 0.0 | 0.0% | - |
| #17 | a postgres driver for crystal | D•Risky | 0.0 | 0.0% | - |
| #18 | The batteries-included web framework for Crystal. | D•Risky | 0.0 | 0.0% | - |
| #19 | Crystal ORM using ActiveRecord pattern with flexible query DSL | D•Risky | 0.0 | 0.0% | - |
| #20 | :guitar: :notes: A music downloader that understands your metadata needs. | D•Risky | 0.0 | 0.0% | - |
| #21 | An intelligent AMQP proxy, with connection and channel pooling/reusing | D•Risky | 0.0 | 0.0% | - |
| #22 | Full featured Redis client for Crystal | D•Risky | 0.0 | 0.0% | - |
| #23 | Crystal bindings to SFML multimedia/game library | D•Risky | 0.0 | 0.0% | - |
| #24 | Database wrapper and ORM for Crystal, inspired by Ecto | D•Risky | 0.0 | 0.0% | - |
| #25 | A speculative new protocol 🌸 | D•Risky | 0.0 | 0.0% | - |
| #26 | :book: Examples of GOF patterns written in Crystal | D•Risky | 0.0 | 0.0% | - |
| #27 | ORM Model with Adapters for mysql, pg, sqlite in the Crystal Language. | D•Risky | 0.0 | 0.0% | - |
| #28 | 已弃用，请转向 Policr Mini | D•Risky | 0.0 | 0.0% | - |
| #29 | The microframework for writing powerful web applications. | D•Risky | 0.0 | 0.0% | - |
| #30 | Build/Runs your crystal application, watches files, and rebuilds/restarts app on file changes | D•Risky | 0.0 | 0.0% | - |
| #31 | Advanced ORM between postgreSQL and Crystal | D•Risky | 0.0 | 0.0% | - |
| #32 | f/guardian280 Guardian watches over your files and run assigned tasks. | D•Risky | 0.0 | 0.0% | - |
| #33 | Decrypt CIA/3DS roms in UNIX environments (Linux and macOS) | D•Risky | 0.0 | 0.0% | - |
| #34 | Minimum High Performance Middleware for Crystal Web Server. | D•Risky | 0.0 | 0.0% | - |
| #35 | HTTP and REST client for Crystal | D•Risky | 0.0 | 0.0% | - |
| #36 | A background task runner for crystal applications supporting periodic (CRON) and manually queued jobs | D•Risky | 0.0 | 0.0% | - |
| #37 | Slim-inspired templating language for Crystal | D•Risky | 0.0 | 0.0% | - |
| #38 | [MIRROR] 🦈🏳️⚧️🏳️🌈 Gay sharks at your local terminal - lolcat-like CLI tool | D•Risky | 0.0 | 0.0% | - |
| #39 | HTTP load testing for CI/CD — 115K req/s, single binary, JSON output | D•Risky | 0.0 | 0.0% | - |
| #40 | Automatically skip sponsor segments and ads in YouTube videos playing on Chromecast. | D•Risky | 0.0 | 0.0% | - |
| #41 | a graphql implementation for crystal | D•Risky | 0.0 | 0.0% | - |
| #42 | JWT implementation in Crystal | D•Risky | 0.0 | 0.0% | - |
| #43 | A performant, and portable jq wrapper to facilitate the consumption and output of formats other than JSON; using jq filters to transform the data. | D•Risky | 0.0 | 0.0% | - |
| #44 | tbrand/neph205 A modern command line job processor, similar with make command | D•Risky | 0.0 | 0.0% | - |
| #45 | Thread-safe, persistent, immutable collections for the Crystal language | D•Risky | 0.0 | 0.0% | - |
| #46 | 🐈 The Charly Programming Language | Written by @KCreate | D•Risky | 0.0 | 0.0% | - |
| #47 | [MIRROR] Check hashes for your files - A GUI tool to generate, compare and verify MD5, SHA-1, SHA-256, SHA-512, Blake3, CRC32 & Adler32 hashes. | D•Risky | 0.0 | 0.0% | - |
| #48 | Yet another markdown parser, Compliant to CommonMark specification, written in Crystal. | D•Risky | 0.0 | 0.0% | - |
How to Get Your Crystal PR Merged
1
Check C-Rank™ First: Pick projects with S or A tiers to avoid maintainer ghosts and slow review cycles.
2
Run Local Verification: Ensure test suites and formatting linters pass before opening a pull request.
3
Submit in Maintainer Windows: Check the repository report card to submit when maintainers are most active.
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Frequently Asked Questions: Crystal Open Source
What is the most welcoming Crystal open-source repository?
The highest-ranked Crystal repository on GetMerged is currently kemalcr/kemal, with a C-Rank score of 78.8/100 and a 100.0% PR merge rate.
How can I find good first issues in Crystal?
You can browse verified beginner-friendly issues in Crystal by visiting our curated Good First Issues directory at getmerged.abhishekco.de/good-first-issue/crystal.
What makes a Crystal repository ‘Super Welcoming’ on GetMerged?
A ‘Super Welcoming’ (S-Tier) Crystal repository demonstrates an external PR merge rate above 80%, a median first response time within 24 to 48 hours, active review feedback, and clear onboarding documentation.