* [Supabase Realtime v2.130.0](https://github.com/supabase/realtime) – Server for broadcasting messages, tracking shared state, and listening to Postgres changes via WebSockets.

* [Parabol v13.38.0](https://github.com/ParabolInc/parabol) – Open-source application for running agile meetings like retrospectives and Sprint Poker.

* [PocketBase v0.40.0](https://github.com/pocketbase/pocketbase) – Go backend with an embedded database, real-time subscriptions, user management, and a simple API.

* [Ably 2.28.0](https://github.com/ably/ably-js) – JavaScript client library for realtime messaging and data synchronization.