Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
OnlineSequencer.net - OnlineSequencer.net is an online music sequencer that allows users to create beats and music tracks.
Reaper - Reaper is a focused digital audio workstation (DAW) developed by Cockos. In the creation of the software, the digital audio technology company intended to make audio editing accessible to the masses.
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.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
AudioSauna - AudioSauna is a full-featured audio workstation for making music online.