Pidgin is cross-platform GTK2 InstantMessaging, IRC and Voice/Video client for GNU/Linux, MicrosoftWindows and other systems. It supports many common InstantMessaging protocols, including Jabber.
Homepage: 
http://pidgin.im/
The libpurple IM protocol library is used in many other applications, including jabber transports and Adium, a pidgin clone for OS X.
2 pages link to Pidgin:
