Products of SIP Communicator
SIP Communicator is an audio/video Internet phone and instant messenger that supports some of the most popular VoIP and instant messaging protocols such as SIP, Jabber, AIM/ICQ, MSN, Yahoo! Messenger, Bonjour and a whole lot of other useful features. SIP Communicator is completely Open Source / Free Software, and is freely available.
Freeware download of SIP Communicator 1.0, size