Obsidian second brain: turns brain dumps into linked notes, keeps daily notes and reviews, answers from your vault with links; never edits without your yes.
Keeps an Obsidian vault of notes and instructions for each of your Grok Bots: files what they learn, replaces stale notes, tidies nightly, syncs to your PC.
Keeps a personal second-brain wiki in a git repo: files your chats, notes, links and decisions as dated, sourced pages, flags conflicts and tidies weekly.