GoatTracker - This is a crossplatform C64 music editor.
Bosca Ceoil - A free, easy to use tool for creating music.
OnlineSequencer.net - OnlineSequencer.net is an online music sequencer that allows users to create beats and music tracks.
Jeskola Buzz - Jeskola Buzz is an all in one digital audio workstation that allows you to edit music with the perfect blending by using modern tools and technology.
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.
ACID Pro - Meet the new version: ACID Pro 9 is where creativity meets inspiration, a DAW designed for every producer to realize their music making ambitions.