Amber Notes: the free, open-source notes app for iPhone and Mac that ChatGPT and Claude can use (MCP).
docouno/notariumFile-first knowledge base for humans and AI agents — self-hosted Markdown notes with a web editor and a built-in MCP server.
michaelbrowk/brainA notes app you keep on your own server. Markdown files, git on every save, MCP for Claude. MIT.