Tkabber
Tkabber is a GPL instant messaging client for the XMPP protocol which uses the Tk toolkit for the GUI. It runs on anything to which Tcl/Tk is ported: almost any X-based system, Microsoft Windows, and Mac OS X.
History
Tkabber was started by Alexey Shchepin in 2002. Several people contributed into it, notably Marshal T. Rose, Michail Litvak and Sergei Golovan, who is the current maintainer of the project.In October 2004, Alexey Shchepin won an Honorable Mention for Tkabber in the ActiveState Programmer Network's Coolest Tk Screenshot Contest. Coincidentally, another Jabber/XMPP client was a Grand Prize Winner: Mats Bengtsson for Coccinella.
The word "Tkabber" is built of two words: "Tk" and "Jabber" which alludes to the GUI toolkit used and the family of network protocols implemented. No one really knows how it is pronounced. Russian speakers pronounce it as .