SiYuan

SiYuan is a privacy-first, local-first, open-source personal knowledge management application built around fine-grained content blocks, with Markdown WYSIWYG editing, block-level references and bidirectional links, databases, flashcards and end-to-end encrypted sync. Available for Windows, macOS, Linux, Android, iOS and HarmonyOS, and self-hostable via Docker.

• Open-source alternative to: Notion, Evernote
• Licence: AGPL-3.0 (Network copyleft open source)
• Website: https://b3log.org/siyuan
• Source code: https://github.com/siyuan-note/siyuan
• GitHub stars: 47016, forks: 3091
• Topics: notes, knowledge base, markdown, bidirectional links, personal knowledge management, agentic-ai, ai-agent, knowledge-base, local-first, mcp, note-taking, self-hosted