MIT-licensed QM (quartermaster). Multiplayer agent harness for Slack and web. Per-person and per-room scoped memory, permissions, sandboxes. Model-agnostic: Pi, OpenCode, Codex, Claude Code. TypeScript/Node, Fastify, Postgres. Deploy via qm init to Fly/AWS. Homepage qm.ycombinator.com. Early/buggy experiment disclaimer. Thousands of stars shortly after release.