High Quality Content by WIKIPEDIA articles! MCabber is a free software client for the instant messaging protocol XMPP with a text user interface based on ncurses. It runs on a range of platforms, including GNU/Linux, BSD, and Mac OS X. As free software it is freely available – including the source code – under the terms of the GNU General Public License (GPL). MCabber is the successor of Alejandro Jimenez Macias` (AJMacias, Winnetou) earlier Cabber that has had releases from 2002 to 2004. In 2005 it has been forked off the last version of Cabber (0.5.0).