Jitsi - audio/video Internet phone and instant messenge
Program: Jitsi
License: Open Source / Free Software, available under the terms of the LGPL
Description: "Jitsi is an audio/video Internet phone and instant messenger written in Java. It supports some of the most popular instant messaging and telephony protocols such as SIP, Jabber/XMPP (and hence Facebook and Google Talk), AIM, ICQ, MSN, Yahoo! Messenger, IRC, Bonjour and soon others like IAX.
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