Jabber is an open-source message system, similar to AOL Instant Messenger, Yahoo chat, the Microsoft Network messenger, and similar systems. Information on Jabber can be found at:
The Exobox project also implemented a Jabber client. While the client itself cannot be extracted frob Exobox code, the low level code can be downloaded from this page: LP-Jabber-Protocol.st. Also, the Exobox XML parser is required; it may be downloaded from XML: Parsers.