Top SECOND-BRAIN GitHub Repositories & Tools (2026)

An AI second brain that maintains itself. Full guide, starter vault, agent skills and scripts for a self-organizing knowledge base in Claude Code and Obsidian.

OpenHuman is the fastest, cheapest, most efficient open-source agent harness. Written in Rust

Get tasks and ideas out of your head. A free GTD to-do app for desktop and mobile. Works offline, no account needed

An on-device LLM understands your entire life, then proactively offers to get your work done through computer use.

A queryable second brain over your scattered notes and docs - hybrid retrieval (vector + BM25), section-level citations, and an MCP server so AI agents can use it. ~300 lines, no LangChain.

AI assistant in Telegram that remembers everything and helps you run your life. Self-hosted in one command.

Your Self-Hosted Knowledge Base