OnlineSequencer.net - OnlineSequencer.net is an online music sequencer that allows users to create beats and music tracks.
Jokosher - Jokosher is a simple and powerful multi-track studio.
GoatTracker - This is a crossplatform C64 music editor.
Fission - Edit audio in minutes, not hours.
Jummbox - A modified Beepbox that have more stuff then Beepbox. It can be used just like Beepbox. The features of Jummbox is the same of Beepbox's features, but Jummbox have more stuff to offer.
MusicBoard - Mb Launchpad is the first Linux launchpad.