Web Sockets & Ajax4
| socket.io | Realtime application framework for Node.JS, with HTML5 WebSockets and cross-browser fallbacks support. |
| sockjs | WebSocket emulation - Node.js server |
| beseda | Beseda is fast, well designed and featured Node.js Pub/Sub server. Beseda offers multiple platform API to develop realtime web applications. |
| minotaur | Cross browser, long poll server implemented in node.js. |