Gabber
Gabber: the gnome jabber client
http://gabber.sourceforge.net/
GAIM
GAIM
http://gaim.sourceforge.net/
Gnome Meeting
Ekiga's home.
http://www.gnomemeeting.org/
GnomeICU
GnomeICU
http://gnomeicu.sourceforge.net/
Xchat
Xchat
http://www.xchat.org/