MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
keezy - A colorful soundboard. Play with music.
OpenMPT - OpenMPT is a popular tracker software for Windows.
SoundGrail - SoundGrail Music App designed for pianists, guitarists, and DJs.
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.
Aftertouch - Aftertouch – 3D MIDI Controller created and published by Kevin Nelson.