AFFiNE

AFFiNE is an open-source, privacy-focused knowledge management and collaboration platform that combines note-taking, whiteboarding, and database capabilities. It uses a block-based editor similar to Notion, but with a strong emphasis on local-first architecture and end-to-end encryption. AI features include smart search, auto-tagging, and content summarization. AFFiNE targets users who value data ownership and want a self-hostable alternative to proprietary tools. Its unique aspect is the ability to run entirely offline and sync via a personal server or cloud of choice.