The 15 best open-source Claude libraries in 2026, ranked by our maintenance-health metric plus real adoption (stars and weekly downloads) and security signals. Right now ECC leads the field with a 100/100 health score. Each links to a full analysis with install commands, license, and alternatives.
ECC is an open-source JavaScript project in the claude space with 210k GitHub stars. The repository is actively maintained, with recent commits.
prompts.chat is a large, community-curated collection of ready-to-use prompt examples for AI chat models (originally ChatGPT), packaged as a browsable site, downloadable datasets, a self-hostable prompt library, and integrations like a CLI, Claude Code plugin, and MCP server.
skills is an open-source Shell project in the claude space with 120.3k GitHub stars. The repository is actively maintained, with recent commits.
claude-code is an open-source Python project in the claude space with 130.9k GitHub stars. The repository is actively maintained, with recent commits.
gstack is an open-source TypeScript project in the claude space with 108k GitHub stars. The repository is actively maintained, with recent commits.
cc-switch is an open-source Rust project in the claude space with 94.1k GitHub stars. The repository is actively maintained, with recent commits.
claude-mem is an open-source TypeScript project in the claude space with 81.1k GitHub stars. The repository is actively maintained, with recent commits.
netdata is an open-source C project with 79.1k GitHub stars. It is associated with ai, alerting, cncf, data-visualization. The repository is actively maintained, with recent commits.
caveman is an open-source JavaScript project in the claude space with 69.8k GitHub stars. The repository is actively maintained, with recent commits.
graphify is an open-source Python project in the claude space with 61.8k GitHub stars. The repository is actively maintained, with recent commits.
Open Design is a local-first, open-source desktop app that turns the coding agents already on your machine (Claude Code, Codex, Cursor, Copilot, etc.) into a design engine, generating brand-grade artifacts — prototypes, dashboards, decks, images and motion graphics — from a filesystem of skills, plugins, and DESIGN.md design systems. It positions itself as an agent-era alternative to Claude Design and Figma, exported to HTML/PDF/PPTX/MP4.
A 20-chapter tutorial that teaches agent "harness engineering" by building a Claude Code-style coding agent from scratch in Python, layering tools, context management, subagents, permissions, and MCP routing on top of a minimal agent loop. Its central thesis is that intelligence comes from the model while engineers build the operational environment around it.
awesome-claude-skills is an open-source Python project in the claude space with 63.6k GitHub stars. The repository is actively maintained, with recent commits.
minds is an open-source Dockerfile project with 39.3k GitHub stars. It is associated with agents, ai, analytics, artificial-inteligence. The repository is actively maintained, with recent commits.
code-review-graph is an open-source Python project in the claude space with 18.4k GitHub stars. The repository is actively maintained, with recent commits.