Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
Audulus - A universe of sound at your fingertips - Audulus is a modular music processing app
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.
Blocs Wave - A free audio app for creating music loops.
GarageBand - GarageBand is a fully equipped music creation studio for Mac
FL Studio Mobile - Create & save multi-track music projects on a smartphone