Jabber (XMPP)

The Jabber protocol is a popular, open protocol for real-time messaging and presence notification.

Prior Art

Xmpp4Js is an XMPP client library written in pure Javascript http://xmpp4js.sourceforge.net/
JSJaC - JavaScript Jabber/XMPP Client Library http://blog.jwchat.org/jsjac/
Strophe - Javscript XMPP client library with excellent protocol support http://code.stanziq.com/strophe/
xmppjs — Strophe for components on node.js: http://github.com/mwild1/xmppjs
node-xmpp — Asynchronous XMPP client/component library for node.js: http://github.com/astro/node-xmpp/