YC CEO Garry Tan open-sources his 'second brain' agent memory system, 31.7k GitHub stars
QuixiAI · x · 2026-11-09
YC CEO Garry Tan has open-sourced gbrain (MIT), his personal second-brain / agent memory system, now at 31.7k stars and 4.7k forks on GitHub. Every fact keeps its source, and all agents share one memory; it plugs into OpenClaw/Hermes-style agent setups.
The thread rounds up 8 lesser-known second-brain repos:
- Karpathy's llm wiki: the original idea file behind the trend
- ai-memory: plain-markdown memory to hand off work between Claude Code and Codex without losing context
- agent second brain: Telegram voice notes land as linked notes in your Obsidian vault
- cog second brain: 33 skills and 10 agents running on plain markdown, no database
- open second brain: a nightly pass organizes newly saved sources
An accompanying article covers building a Claude + Obsidian second brain that gets smarter with every source you save.
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