"WebSockets are stable and ready for developers to start creating innovative applications and services."
http://www.sitepoint.com/websockets-stable-and-ready-for-developers/
https://www.openhub.net/tags/php/websocket
https://speakerdeck.com/cboden/true-north-websocket-talk
http://en.wikipedia.org/wiki/WebSocket
http://en.wikipedia.org/wiki/Comparison_of_WebSocket_implementations
See also