Eight open-source 'second brain' repos for AI agent memory, including gbrain

AIA social post lists eight open-source "second brain" repositories for storing knowledge and sharing memory across AI agents. The list includes gbrain by Garry Tan, which the post says keeps source attribution for every fact and shares one memory across agents, and Andrej Karpathy's LLM wiki idea file. Other entries use plain markdown and Obsidian for memory handoff between Claude Code and Codex, voice notes in Telegram, and nightly conversion of repeated corrections into agent rules.

AIA viral X post lists eight open-source "second brain" repositories for AI agents and personal knowledge management, including gbrain by Garry Tan, which keeps a source for every fact and shares one memory across agents. Other entries include Andrej Karpathy's LLM wiki idea file, ai-memory for handing work between Claude Code and Codex in plain markdown, and baalda, a team markdown memory that people and agents edit together.