Welcoming Repositories Index Assembly Ecosystem
Top Welcoming Open-Source Assembly Repositories
Top welcoming Assembly 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
361
>100 stars verified
Avg Merge Rate
77%
90-day external PRs
Open GFIs
16
Beginner friendly issues
Welcoming Tier
16
S & A Tier maintainers
Ranked Assembly Repositories
Showing top 50 of 361 ranked repositories
| Rank | Repository | Tier | Score | Merge Rate | Good First Issues |
|---|---|---|---|---|---|
| #1 | z88dk/z88dk1,143 The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries. | A•Welcoming | 69.0 | 85.7% | - |
| #2 | System Software for Z80/Z180/Z280 Computers | A•Welcoming | 67.3 | 91.7% | 1 |
| #3 | Secure, fast, and portable C90 implementation of ML-KEM / FIPS 203 | A•Welcoming | 66.4 | 80.9% | - |
| #4 | ebitengine/purego4,014 A library for calling C functions from Go without Cgo | A•Welcoming | 65.7 | 56.5% | - |
| #5 | An upgrade to Pokémon Crystal. Brings features and content up to date, and adds some original content. | A•Welcoming | 65.3 | 64.0% | - |
| #6 | apple/swift-crypto1,731 Open-source implementation of a substantial portion of the API of Apple CryptoKit suitable for use on all Swift supported platforms. | A•Welcoming | 64.9 | 64.3% | - |
| #7 | Official Go implementation of Apache Arrow | A•Welcoming | 64.6 | 82.4% | 2 |
| #8 | super repo for rocm libraries | A•Welcoming | 63.7 | 8.4% | 7 |
| #9 | Secure, fast, and portable C90 implementation of ML-DSA / FIPS 204 | A•Welcoming | 62.5 | 61.3% | - |
| #10 | aws/aws-lc838 AWS-LC is a general-purpose cryptographic library maintained by the AWS Cryptography team for AWS and their customers. It іs based on code from the Google BoringSSL project and the OpenSSL project. | A•Welcoming | 61.9 | 56.3% | - |
| #11 | Disassembly of Legend of Zelda: Link's Awakening DX | B•Solid | 61.6 | 100.0% | - |
| #12 | The RISC-V Architectural Certification Tests (ACTs) are a set of assembly language tests designed to certify that a design faithfully implements the RISC-V specification. | A•Welcoming | 61.2 | 43.1% | - |
| #13 | Proposal for a RISC-V Core-Local Interrupt Controller (CLIC) | B•Solid | 59.4 | 85.7% | - |
| #14 | #FreeGEOS source codes. The offical home of the PC/GEOS operating system technology. For personal computing fans. For all developers and assembly lovers. For YOU! | A•Welcoming | 59.4 | 77.8% | 1 |
| #15 | Intel® Software Guard Extensions SSL | A•Welcoming | 57.4 | 34.0% | - |
| #16 | zeebo/blake3498 Pure Go implementation of BLAKE3 with AVX2 and SSE4.1 acceleration | A•Welcoming | 57.1 | 100.0% | - |
| #17 | Disassembly of the Pokémon Gold and Silver 1997 Space World demo | A•Welcoming | 56.9 | 96.3% | - |
| #18 | A work in progress decompilation of Wave Race 64 | B•Solid | 56.2 | 83.3% | - |
| #19 | Decompilation of Pokemon HeartGold/SoulSilver | B•Solid | 56.2 | 37.5% | - |
| #20 | openhwgroup/cva63,070 The CORE-V CVA6 is a highly configurable, 6-stage RISC-V core for both application and embedded applications. Application class configurations are capable of booting Linux. | A•Welcoming | 56.1 | 25.4% | - |
| #21 | Geometry Dash for the Nintendo Entertainment System | B•Solid | 54.8 | 100.0% | - |
| #22 | giaf/blasfeo421 Basic linear algebra subroutines for embedded optimization | B•Solid | 54.6 | 100.0% | - |
| #23 | Simple 16 bit (real mode) operating system writen in NASM from scratch | B•Solid | 54.6 | 28.6% | - |
| #24 | Reed-Solomon Erasure Coding in Go | B•Solid | 54.5 | 100.0% | - |
| #25 | pret/pmd-sky129 Decompilation of Pokémon Mystery Dungeon: Explorers of Sky | B•Solid | 54.1 | 80.0% | - |
| #26 | a2stuff/a2d323 Disassembly of the Apple II Desktop - ProDOS GUI | B•Solid | 53.0 | 100.0% | - |
| #27 | Virtual Apollo Guidance Computer (AGC) software | B•Solid | 52.6 | 100.0% | - |
| #28 | Learn to create games for the Game Boy using Assembly | B•Solid | 52.5 | 66.7% | 3 |
| #29 | xiph/rav1e4,160 The fastest and safest AV1 encoder. | B•Solid | 52.5 | 100.0% | - |
| #30 | B•Solid | 51.4 | 75.0% | - | |
| #31 | pret/pokered4,976 Disassembly of Pokémon Red/Blue | B•Solid | 51.3 | 80.0% | - |
| #32 | Sonic 2 Disassembly | B•Solid | 50.8 | 83.3% | - |
| #33 | Disassembly of Pokemon Yellow | B•Solid | 50.4 | 80.0% | - |
| #34 | A GUI shell for the TI-84+CE | B•Solid | 49.9 | 100.0% | - |
| #35 | Modding engine for Smash Remix | B•Solid | 49.7 | 25.0% | - |
| #36 | SheerSt/pokewilds2,907 PokeWilds - A Gen 2 Game/Engine using libGDX | B•Solid | 49.5 | 100.0% | - |
| #37 | An AV1 decoder in Rust. | B•Solid | 49.1 | 20.0% | - |
| #38 | maziac/DeZog276 Visual Studio Code Debugger for Z80/ZX Spectrum. | B•Solid | 49.1 | 100.0% | - |
| #39 | SpinalHDL/VexRiscv3,282 A FPGA friendly 32 bit RISC-V CPU implementation | B•Solid | 48.6 | 100.0% | - |
| #40 | A CPU tool for benchmarking the peak of floating points | B•Solid | 48.4 | 100.0% | - |
| #41 | RibShark/OmniDrive1,183 | B•Solid | 48.4 | 33.3% | - |
| #42 | Hashing for Modern Object Pascal | B•Solid | 48.4 | 100.0% | - |
| #43 | nes tetris training rom | B•Solid | 48.2 | 100.0% | - |
| #44 | Extended Call of Duty 4 server | B•Solid | 48.1 | 100.0% | - |
| #45 | Illusion of Gaia SNES Retranslation Project | B•Solid | 48.0 | 100.0% | - |
| #46 | Decompilation of Pokémon Pinball: Ruby & Sapphire | B•Solid | 48.0 | 100.0% | - |
| #47 | Official RC2014 repository for hardware schematics / software and more! | B•Solid | 47.9 | 100.0% | - |
| #48 | Functional verification project for the CORE-V family of RISC-V cores. | B•Solid | 47.6 | 75.0% | - |
| #49 | Command-line cross-compiler of assembly language for Z80 CPU. | B•Solid | 47.5 | 51.4% | 2 |
| #50 | Aprenda a linguagem Assembly do zero! | B•Solid | 47.3 | 100.0% | - |
How to Get Your Assembly 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: Assembly Open Source
What is the most welcoming Assembly open-source repository?
The highest-ranked Assembly repository on GetMerged is currently z88dk/z88dk, with a C-Rank score of 69.0/100 and a 85.7% PR merge rate.
How can I find good first issues in Assembly?
You can browse verified beginner-friendly issues in Assembly by visiting our curated Good First Issues directory at getmerged.abhishekco.de/good-first-issue/assembly.
What makes a Assembly repository ‘Super Welcoming’ on GetMerged?
A ‘Super Welcoming’ (S-Tier) Assembly 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.