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SIP Software

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Application
License
Platform
Comment
Jitsi
LGPL
Java (Linux, MAC OS X, Windows)
formerly known as "SIP Communicator", Jitsi also supports XMPP Jingle
Ekiga
GPL
Linux
Linphone
GPL v2
iPhone, Blackberry, Android, OS X, Linux
Empathy
GPL
Linux
PSI+
GPLv2
QT (GNU+Linux, BSD, OS X, Windows)
Jabber-compatible client; uses Psimedia library for voice/video, support XMPP/Jingle
Blink
GPL v3
Linux, OS X
QuteCom (formerly Wengo)
GPL v2
Google Voice
USA-only
iSoftPhone
telephone
X-Lite
Media5-Fone




See also Wikipedia's Comparison of VoIP Software