I've been working on a plugin (Relay) [0] for Obsidian that makes it real-time collaborative. Obsidian has the perfect user experience for markdown wiki-style notes, but it was lacking the realtime collaboration. We use Obsidian+Relay internally every day and it is so so much nicer than Confluence, Notion, or Google docs -- plus it is super extensible so we can use additional plugins for Claude, mermaid.js, etc.