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The best open-source Claude Code extensions, sorted by GitHub stars.
Community content — not audited. Everything here is third-party open source. Read The Supply Chain before installing anything.

Collections

Curated indexes and awesome lists.

Skills

Drop-in skill packages.

Memory

Session persistence and context injection.

Orchestration

Multi-agent systems and harnesses.

Tools

Desktop apps, CLIs, MCP servers.

Commands

Slash command suites.