Idavoll is an implementation of a generic publish-subscribe service component for Jabber servers, as described in JEP-0060
An ajax web jabber client
iJab is an Ajax-based web based instant messaging program for XMPP/Jabber. It is free software
Secure video calls, conferencing, chat, desktop sharing, file transfer, support for your favorite OS, and IM network. All this, and more, in Jitsi - the most complete and advanced open source communicator.