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This is f*cking insane, the CEO of Y Combinator open-sourced his own second brain and most people still don’t know it exists 8 second brain repos you haven’t seen yet: -> gbrain (by garrytan) github.com/garrytan/gbrain the second brain of the YC CEO, every fact keeps its source and every agent shares one memory -> llm wiki (by karpathy) gist.github.com/karpathy/442… the original idea file behind all of this -> ai-memory (by akitaonrails) github.com/akitaonrails/ai-m… hand the work from Claude Code to Codex without losing context, memory lives in plain markdown -> agent second brain (by smixs) github.com/smixs/agent-secon… send a voice note in Telegram and it lands as a linked note in your Obsidian vault -> cog second brain (by huytieu) github.com/huytieu/COG-secon… 33 skills and 10 agents running on plain markdown, no database -> open second brain (by itechmeat) github.com/itechmeat/open-se… a nightly pass turns the corrections you keep repeating into rules your agent follows -> claude second brain (by jessepinkman9900) github.com/jessepinkman9900/… one npx command scaffolds Obsidian, Claude Code and local search -> baalda (by naveedharri) github.com/naveedharri/baald… a team second brain where people and agents edit the same markdown files the CEO of Y Combinator runs his agents on this you are still digging through bookmarks