Gajim is a Jabber client based on a plugin system.  At this time, 2 plugins
have been written: one in GTK2 and one that log messages.

FEATURES:

    * Tabbed chat windows
    * Groupchat support (with MUC protocol)
    * Emoticons, URL grabber
    * Systray icon
    * GPG support
    * Multiple accounts support

WWW: http://www.gajim.org/