SIP Software
| - |
| 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