Awesome AI Agent Stack

A curated directory of open-source tools for building AI agents, organized across 29 categories from coding agents and frameworks down to model serving and UI layers. Covers agent harnesses, skills engineering, orchestration, memory systems, RAG, MCP servers, sandboxes, document processing, workflow automation, model gateways, local inference, observability, voice, vision, and computer use. Each tool is verified as active (pushed within 12 months), publicly available, and not archived; entries are ranked by GitHub stars and re-checked against the GitHub API. The site includes search, sorting, and a learning path ordered from beginner to advanced concepts.