Fast & Scalable Front/Back-ends using Ruby, Rails & XMPP

XMPP (eXtensible Messaging and Presence Protocol) is an open standard protocol for messaging, presence, and request-response services. It is XML-based and commonly used as the backend for instant messaging systems. XMPP supports features like instant messaging, presence, publish/subscribe, and federation. Popular XMPP servers include eJabberd, Openfire, and Tigase. XMPP can provide fast, scalable services and real-time interfaces when used with libraries like XMPP4R, Strophe.js, and BOSH (Bi-Directional-Streams Over Synchronous HTTP). Present.ly is an example of a system that uses these technologies for a real-time collaborative platform