centrifugal
Scalable real-time messaging server in a language-agnostic way. Self-hosted alternative to Pubnub, Pusher, Ably, socket.io, Phoenix.PubSub, SignalR. Set up once and forever.
evolution-foundation
Evolution API is an open-source WhatsApp integration API
soketi
Next-gen, Pusher-compatible, open-source WebSockets server. Simple, fast, and resilient. 📣
sockudo
Blazingly fast pusher drop-in replacement written in rust