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ECC – Ultimate Claude Skills Pack
Massive open-source collection of 279 skills and 67 agents that works across Claude Code, Cursor, Codex and more. Won Anthropic hackathon.
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mattpocock/skills v1.2
Matt Pocock's agent skills repo hits v1.2 with full docs and 63% cheaper skill descriptions. 13.5M downloads and one of the most-starred repos on GitHub.
Thimble
Open source Claude Code plugin that explains what an agent did, with visualizations in the terminal.
Agent Readiness
Claude skill that scores how ready a repo is for a coding agent. Open source.
LeanREA
An 8 KB skill for reverse engineering with plain CLI tools and no MCP server. Free and open source.
