ScopComm

Scopserv Communicator is an audio/video Internet phone and instant messenger , Jabber (XMPP), AIM/ICQ, MSN, Yahoo!

Messenger, and a whole lot of other useful features. Free Software, and is freely available under the terms of the GNU Lesser General Public License. It supports some of the most popular VoIP and instant messaging protocols. Scopserv Communicator is completely Open Source.