Solfege is free music education software. Use it to train your rhythm, interval, scale and chord skills. (GPL)

Guitarix is a simple Linux Rock Guitar Amplifier for jack (Jack Audio Connektion Kit) with one input and two outputs. Designed to get nice thrash/metal/rock/blues guitar sound. (GPL)

Papagayo is a lip-syncing program designed to help you line up phonemes (mouth shapes) with the actual recorded sound of actors speaking. (GPL)

PianoBooster is a fun way of playing along with a musical accompaniment and at the same time learning the basics of reading musical notation. (GPL)

Rivendell is a complete radio broadcast automation solution, with facilities for the acquisition, management, scheduling and playout of audio content. (GPL)

wavbreaker's purpose in life is to take a wave file and break it up into multiple wave files. (GPL)