Linphone : An audio and video Internet phone with GTK+ and console interfaces

Linphone is an audio and video Internet phone with GTK+ and console interfaces. It uses the SIP protocol, and is compatible with most SIP clients and gateways. It can use various audio and video codecs such as Speex, GSM, G711, ilbc, amr, Theora, H263-1998, MPEG4, H264, and snow.

• Licenses : GPL
• Operating Systems : POSIX, Linux, BSD, FreeBSD, Windows, Mac OS X, iPhoneOS, Android
• Implementation : C

Mumble : Low-latency, high quality voice chat software primarily intended for use while gaming

Mumble is low-latency, high quality voice chat software primarily intended for use while gaming. It should compile and run the client out of the box on at least Ubuntu 6.06, and quite likely other distributions as well.

• Licenses : BSD Revised GPL
• Operating Systems : Windows, POSIX, Linux
• Implementation : C++

Mumble : Low-latency, high quality voice chat software primarily intended for use while gaming

Mumble is low-latency, high quality voice chat software primarily intended for use while gaming. It should compile and run the client out of the box on at least Ubuntu 6.06, and quite likely other distributions as well.

• Licenses : BSD Revised, GPL
• Operating Systems : Windows, POSIX, Linux
• Implementation : C++

Imptalk : Real time communication software built to provide face-to-face advantages to remote gamers

Imptalk is real time communication software built to provide face-to-face advantages to remote gamers.
Communication is key to victory in all multiplayer games. Use Imptalk when competing online to give your team a winning edge. It runs on all major platforms including: Windows, Linux, and Mac OS X.

• Licenses : GPLv3
• Operating Systems : Windows, Mac OS X, Linux
• Implementation : C++, wxWidgets, Speex, Ogg, SQLite, Python, Theora

Linphone : An audio and video Internet phone with GTK+ and console interfaces

Linphone is an audio and video Internet phone with GTK+ and console interfaces. It uses the SIP protocol, and is compatible with most SIP clients and gateways. It can use various audio and video codecs such as Speex, GSM, G711, ilbc, Theora, H263-1998, MPEG4, H264, and snow.

• Licenses : GPL
• Operating Systems : POSIX, Linux, BSD, FreeBSD, Windows
• Implementation : C