Gabber is a Jabber client for GNOME. Jabber is a flexible distributed Open Source instant messaging system. It also happens to allow communication with other instant messaging systems, such as ICQ, AIM, Yahoo!, MSN, and even IRC. Gabber aims to implement quite a bit of Jabber's functionality while remaining easy to use.
Gabber is a free software and open-source instant messaging client for GNOME supporting the Jabber protocol. The first version, created by Dave Smith and Julian Missig, was one of the earliest Jabber clients. Gabber 2 was created by Julian Missig and Thomas Muldowney as a rewrite for GNOME 2.