DefleMask - An old-school game music tracker for an ample variety of systems.
GoatTracker - This is a crossplatform C64 music editor.
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.
MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
Audacity - Audacity is a free and open-source audio production software suite that includes a surprising array of editing tools and recording systems.
ChibiTracker - ChibiTracker is not currently in development but downloads are still available from ...