SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
Mixxx - The most powerful free DJ software in the world.
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.
Guitarix - Guitarix is a simple Linux Rock Guitar Amplifier for https://alternativeto.
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.
VirtualDJ - Virtual DJ Software - MP3 and Video mix software for DJs