Gaim / Pidgin
Gaim (now known as Pidgin) is a modular messaging client capable of using AIM, MSN, Yahoo!, Jabber, ICQ, IRC, SILC, SIP/SIMPLE, Novell GroupWise, Lotus Sametime, Bonjour, Zephyr, Gadu-Gadu, and QQ all at once. It is written using GTK+.
CategoryApplicationVarious