JabberFoX is a Jabber client for Mac OS X and the name stands for "Jabber For OS X".
Jabber is an open source instant messaging system fully based on XML. Thanks to the server-side Jabber Agents, Jabber clients can communicate with users of other instant messaging systems, like AIM, ICQ, Yahoo, MSN, or IRC.
JabberFoX is written in Objective-C using Apple's Cocoa API and tries to make full use of Aqua, Apple's cool new user interface system. It aims at implementing all of the standard jabber features including chat, group chat, messages, the roster (buddylist), and agents. Eventually we hope to incorporate all of the features of the Jabber protocol, including browsing, strong encryption and the new conferencing protocol.