Welcoming Repositories Index Nim Ecosystem
Top Welcoming Open-Source Nim Repositories
Top welcoming Nim repositories. Scored by real 90-day external PR merge rates, maintainer review turnaround speed, and first-time contributor success.
Updated daily • Sun, 11 Oct 2026 UTC
Tracked Repos
140
>100 stars verified
Avg Merge Rate
61%
90-day external PRs
Open GFIs
4
Beginner friendly issues
Welcoming Tier
14
S & A Tier maintainers
Ranked Nim Repositories
Showing top 50 of 140 ranked repositories
| Rank | Repository | Tier | Score | Merge Rate | Good First Issues |
|---|---|---|---|---|---|
| #1 | Nimbus: an Ethereum Execution Client for Resource-Restricted Devices | S•Elite | 74.7 | 80.4% | 1 |
| #2 | Nimony is a new Nim implementation that is in heavy development. | S•Elite | 74.0 | 81.1% | - |
| #3 | libp2p implementation in Nim | S•Elite | 72.9 | 79.2% | - |
| #4 | Lightweight, energy-efficient, easily auditable threadpool | A•Welcoming | 66.3 | 100.0% | - |
| #5 | Nim implementation of the Ethereum Beacon Chain | A•Welcoming | 66.0 | 61.5% | - |
| #6 | nim-lang/Nim18,261 Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority). | A•Welcoming | 62.7 | 52.4% | 1 |
| #7 | CodeTracer is a user-friendly time-traveling debugger designed to support a wide range of programming languages. | A•Welcoming | 61.8 | 79.3% | - |
| #8 | The Atlas Package cloner. It manages an isolated workspace that contains projects and dependencies. | A•Welcoming | 61.6 | 94.1% | - |
| #9 | fox0430/moe729 A command line based editor inspired by Vim. Written in Nim. | A•Welcoming | 61.2 | 84.3% | - |
| #10 | Chronos - An efficient library for asynchronous programming | A•Welcoming | 59.7 | 36.4% | - |
| #11 | fast sample-swap and relatedness checks on BAMs/CRAMs/VCFs/GVCFs... "like damn that is one smart wine guy" | B•Solid | 59.1 | 100.0% | - |
| #12 | planety/prologue1,358 Powerful and flexible web framework written in Nim | B•Solid | 59.0 | 100.0% | - |
| #13 | The Nim language server implementation (based on nimsuggest) | A•Welcoming | 58.4 | 66.7% | - |
| #14 | Logos Messaging protocols implemented in Nim | A•Welcoming | 58.4 | 13.3% | - |
| #15 | A curated list of awesome Nim frameworks, libraries, software and resources. | A•Welcoming | 58.3 | 91.7% | - |
| #16 | List of packages for Nimble | A•Welcoming | 56.7 | 75.8% | - |
| #17 | guzba/zippy283 Pure Nim implementation of deflate, zlib, gzip and zip. | B•Solid | 53.7 | 66.7% | - |
| #18 | Nim library for implementing JSON-RPC clients and servers | B•Solid | 52.9 | 91.7% | - |
| #19 | LLVM-based compiler for the Nim language | B•Solid | 52.2 | 100.0% | - |
| #20 | libp2p implementation in Nim | B•Solid | 51.3 | 14.3% | 1 |
| #21 | Automatic wrapping of C headers in Nim | B•Solid | 51.1 | 100.0% | - |
| #22 | Pure Nim regex engine. Guarantees linear time matching | B•Solid | 50.8 | 100.0% | - |
| #23 | An in development statically typed systems programming language; with sustainability at its core. We, the community of users, maintain it. | B•Solid | 50.3 | 100.0% | - |
| #24 | The official Nim programming language plugin for Sublime Text | B•Solid | 50.3 | 100.0% | - |
| #25 | Async Telegram Bot API Client implement in @Nim-Lang | B•Solid | 48.2 | 100.0% | - |
| #26 | :rocket: seqfu - Sequece Fastx Utilities | B•Solid | 48.2 | 100.0% | - |
| #27 | karaxnim/karax1,167 Karax. Single page applications for Nim. | B•Solid | 47.3 | 100.0% | - |
| #28 | A curses inspired simple cross-platform console library for Nim | B•Solid | 46.3 | 100.0% | - |
| #29 | Full-featured 2d graphics library for Nim. | B•Solid | 45.2 | 60.0% | - |
| #30 | A declarative user interface framework based on GTK 4 | B•Solid | 44.3 | 100.0% | - |
| #31 | dom96/jester1,628 A sinatra-like web framework for Nim. | B•Solid | 43.5 | 100.0% | - |
| #32 | Cross-platform desktop GUI toolkit written in Nim | B•Solid | 43.5 | 100.0% | - |
| #33 | Dear ImGui style browser and editor written in Nim | B•Solid | 43.5 | 100.0% | - |
| #34 | treeform/ws266 Simple WebSocket library for Nim. | B•Solid | 43.5 | 0.0% | - |
| #35 | Nim wrapper for SDL 2.x | B•Solid | 43.5 | 0.0% | - |
| #36 | Puppy fetches via HTTP and HTTPS | B•Solid | 43.5 | 0.0% | - |
| #37 | A crafty implementation of structured logging for Nim. | B•Solid | 42.0 | 66.7% | - |
| #38 | fast BAM/CRAM depth calculation for WGS, exome, or targeted sequencing | B•Solid | 41.7 | 50.0% | - |
| #39 | genetic variant expressions, annotation, and filtering for great good. | B•Solid | 41.1 | 100.0% | - |
| #40 | Figma based UI library for nim, with HTML and OpenGL backends. | B•Solid | 40.6 | 0.0% | - |
| #41 | Effort free video editing! | C•Moderate | 35.4 | 20.0% | - |
| #42 | A small systemfetch written in nim | C•Moderate | 34.6 | 100.0% | - |
| #43 | nimib 🐳 - nim 👑 driven ⛵ publishing ✍ | C•Moderate | 33.3 | 0.0% | - |
| #44 | zedeus/nitter13,447 Alternative Twitter front-end | D•Risky | 29.9 | 0.0% | 1 |
| #45 | yglukhov/nimpy1,590 Nim - Python bridge | D•Risky | 29.9 | 0.0% | - |
| #46 | A highly performant, multi-threaded HTTP 1.1 server written in Nim. | D•Risky | 29.9 | 0.0% | - |
| #47 | qb-0/pyMeow449 Python Game Hacking Library | D•Risky | 29.9 | 0.0% | - |
| #48 | Pure Nim implementation for exploiting CVE-2021-36934, the SeriousSAM local privilege escalation | D•Risky | 29.9 | 0.0% | - |
| #49 | steam_api.dll implementation for wine. Your windows games now can interact with your linux steam! (This repo mirrors https://gitlab.com/xomachine/SteamForwarder) | D•Risky | 29.9 | 0.0% | - |
| #50 | Continuation-Passing Style for Nim 🔗 | D•Risky | 29.4 | 0.0% | - |
How to Get Your Nim 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: Nim Open Source
What is the most welcoming Nim open-source repository?
The highest-ranked Nim repository on GetMerged is currently status-im/nimbus-eth1, with a C-Rank score of 74.7/100 and a 80.4% PR merge rate.
How can I find good first issues in Nim?
You can browse verified beginner-friendly issues in Nim by visiting our curated Good First Issues directory at getmerged.abhishekco.de/good-first-issue/nim.
What makes a Nim repository ‘Super Welcoming’ on GetMerged?
A ‘Super Welcoming’ (S-Tier) Nim 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.