AFFiNE, an open-source, self-hostable service that lets you build your own personal knowledge database for free like Notion or Miro

AFFiNE is an open-source knowledge management platform positioned as a free alternative to Notion and Miro.

It combines block-based document editing with an infinite canvas, plus AI features for writing and planning.

The app works offline with sync, runs across major platforms, and can be deployed locally with Docker for self-hosting.

That makes it appealing for users who want a privacy-focused workspace and full control over their data.