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

ZynAddSubFX : A powerful real-time, multi- timbral software synthesizer for Linux

ZynAddSubFX is a powerful real-time, multi- timbral software synthesizer for Linux. It has microtonal capabilities, and the instruments it creates sound like those from professional keyboards. It includes effects like reverb, echo, chorus, and phaser.

• Licenses : GPL
• Operating Systems : POSIX, Linux, Windows
• 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++

Sonic Visualiser : An application for viewing and analysing the contents of music audio files

Sonic Visualiser is an application for viewing and analysing the contents of music audio files, containing advanced waveform and spectrogram viewers as well as editors for many sorts of audio annotations. It supports sophisticated audio selection, looping, and playback features, as well as the Vamp audio feature extraction plugin format.

• Licenses : GPL
• Operating Systems : POSIX, Linux, Mac OS X, Windows
• Implementation : C++

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

Virtual MIDI Piano Keyboard : A MIDI event generator and receiver

Virtual MIDI Piano Keyboard is a MIDI event generator and receiver. It doesn't produce any sound by itself, but can be used to drive a MIDI synthesizer (either hardware or software, internal or external). You can use the computer's keyboard or mouse to play MIDI notes. You can use the Virtual MIDI Piano Keyboard to display the played MIDI notes from another instrument or MIDI file player.

• Licenses : GPLv3
• Operating Systems : POSIX, Linux, Windows
• Implementation : C++