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.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
DefleMask - An old-school game music tracker for an ample variety of systems.
MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.
FamiTracker - FamiTracker is a free windows tracker for producing music for the NES/Famicom-systems.