Open-source directory of 1,500+ free public APIs, organized for AI agents and developers. Every listing links to real docs and is tagged by auth type, protocol, and capability like search, geocoding, browser automation, LLM, or scraping. Browse 68 categories, 16 capability types, and curated collections like "Best APIs for AI Agents" or "Search and RAG APIs." Built on top of established open-source API lists with validation and structured tagging on top. No login or paywall. PRs welcome!