Open Source #second-brain Projects
Discover open source software tagged with second-brain.
OpenKnowledge
AI-native, local-first markdown editor and LLM wiki with built-in integrations for Claude, Codex, and other agents.
Alternative to: 
Notion
Notion
NoteDiscovery
A self-hosted knowledge base for note-taking with markdown support, Zettelkasten methodology, and Docker deployment.
Alternative to: Notion
Notion
kuku
Open-source local-first Markdown workspace for macOS with wiki, AI editing, and encrypted sync.
Alternative to: 
Obsidian
Obsidian