MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
FluidSynth - FluidSynth is a real-time software synthesizer based on the SoundFont 2 specifications and has...
OpenMPT - OpenMPT is a popular tracker software for Windows.
VirtualMIDISynth - VirtualMIDISynth is a software MIDI synthesizer implemented as a Windows multimedia user driver...
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.
Zebralette - u-he makes creative software synthesizers and effects.