OpenHive is a fully open-source team messaging platform — think Slack, but self-hosted and free. Built with Next.js, Supabase and LiveKit. Real-time channels, DMs, threaded replies, video/audio calls with screen sharing, file uploads, @mentions, slash commands, webhooks, bots, and a fully responsive UI. Clone, run npm run dev, and the setup wizard auto-provisions your database (23+ tables with RLS). No vendor lock-in. Try it: openhivedemo.com — MIT licensed, contributors welcome!