WebSocket-Node - A WebSocket Implementation for Node.JS ( Draft -08 through the final RFC 6455 )
Socket.io - Realtime application framework (Node.JS server)
Pusher - Pusher is a hosted API for quickly, easily and securely adding scalable realtime functionality via WebSockets to web and mobile apps.
eventlet - Eventlet is a concurrent networking library for Python that allows you to change how you run your...
Ably - Serious realtime infrastructure
Jetty - Increase occupancy, reduce costs, and more protection with Jetty’s financial services products for properties and residents.