SoundBetter - Marketplace for musicians and music production professionals
FamiStudio - FamiStudio is very simple music editor for the Nintendo Entertainment System or Famicom. It is designed to be easier to use than FamiTracker, but its feature set is also much more limited.
PrimoMusic - An iTunes alternative made to manage iPhone/iPod media files
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
Melody ML - Easily separate audio tracks using machine learning
Cubasis - Cubasis is Steinberg’s streamlined, multitouch sequencer for the iPad.