Licq
In computing, Licq is a free clone of the original ICQ client that runs on Linux and on other Unix systems. Newer versions have support for ICQ/AIM and MSN. Licq has many of the features of the official client and has no built-in ads, unlike AOL's client. In addition, it is possible to encrypt messages using SSL when talking to contacts that also use Licq or climm or SIM (but Licq doesn't recognize non-Licq SSL capability by itself). It lacks support for sending acknowledged messages. Encryption via GPG is supported through a plugin.
Licq is licensed under the terms of the GNU General Public License. The default user interface uses Qt, though other interfaces, such as the console or the GTK+ ones, are available through the use of plugins.
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