OSSCAR

Top Fastest-Growing Open Source Organizations

Ranked by composite growth across GitHub stars, contributors and package downloads. Updated quarterly by Supabase × >commit.

Read the methodology →
Ranking reveal in progress98 of 100 live. New rankings revealed every weekday.
3
Mnemosyne OSS
Mnemosyne OSS

Mnemosyne is a zero-dependency, SQLite-backed, sub-millisecond local-first AI memory system for Hermes Agents and any agent framework.

Stars
1.4K14×
Contributors
4949×
DownloadsNPM·PyPI
39.7K39.7×
4
Refactoring
Refactoring

Newsletter, podcast, and community about how to ship fast and make good software. Followed by 170K+ engineers and managers. Run by @lucaronin

Stars
18.9K189×
Contributors
2020×
Downloads
Stars
4914.91×
Contributors
151.07×
DownloadsPyPI
500.3K500×
6
Tiny Humans
Tiny Humans

Building AI-powered tiny humans for everyone

Stars
35.5K118×
Contributors
14115.7×
DownloadsNPM·Cargo
2.4K2.42×
7
Open GSD
Open GSD

Most AI coding setups rot as the context window fills. Open GSD keeps the context clean, the work verified, and the git history honest — ship more, worry less.

Stars
6.8K67.9×
Contributors
1611.39×
DownloadsNPM
74.9K74.9×
8
Astrid OS
Astrid OS

By Unicity Labs

Stars
34.9K349×
Contributors
2
Downloads
9
Palmier
Palmier

AI Video Platform

Stars
10.0K99.7×
Contributors
1717×
Downloads
10
Agentseal
Agentseal

“Find what breaks your AI agent before it does.” Probes, testing, and observability for prompts, MCP, and RAG. Open source.

Stars
9.1K56.5×
Contributors
5217.3×
DownloadsNPM·PyPI
126.6K9.58×
11
slopsmith
slopsmith

The music rehearsal program currently known as Slopsmith

Stars
2.2K22.4×
Contributors
4646×
Downloads
Stars
1.9K19.4×
Contributors
4040×
Downloads
13
Lucebox AI
Lucebox AI

A personal inference computer for agents.

Stars
2.7K14.5×
Contributors
4444×
Downloads
14
Kun
Kun

build some cool thing

Stars
5.2K52×
Contributors
2020×
Downloads
Stars
1761.76×
Contributors
6868×
Downloads
Stars
3.7K37.3×
Contributors
8
DownloadsPyPI
217.2K22.8×
17
hi-godot
hi-godot

Open Source AI Tools for Godot

Stars
8528.52×
Contributors
1414×
DownloadsPyPI
86.3K43.1×
18
bug0
bug0

Your AI QA Engineer - combining AI agents and human experts to run browser testing end to end.

Stars
1.1K11.2×
Contributors
72.33×
DownloadsNPM
122.8K123×
Stars
18.5K185×
Contributors
5
Downloads
20
fallow
fallow

Codebase intelligence for TypeScript and JavaScript. Free static analysis of code and styles, optional paid runtime intelligence (Fallow Runtime).

Stars
4.1K10.5×
Contributors
256.25×
DownloadsNPM
8.9M70.9×
21
stella
stella

Open-source legal workspace

Stars
1471.47×
Contributors
1111×
DownloadsNPM
85.4K85.4×
Stars
1.5K15.3×
Contributors
1313×
DownloadsNPM
29.1K21.4×
23
Perry
Perry

TypeScript → Native compiler. One codebase. Every platform. Native performance.

Stars
4.0K35.8×
Contributors
1414×
DownloadsNPM
38.2K4.35×
Stars
5.5K35.9×
Contributors
1616×
DownloadsPyPI
907
25
Unicity Labs
Unicity Labs

Agent Assembly: payments, comms and marketplaces for agents

Stars
13.7K137×
Contributors
71.17×
DownloadsNPM
19.5K1.92×
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