Pata Tracker - Simplified music tracker to compose chiptunes.
GoatTracker - This is a crossplatform C64 music editor.
DefleMask - An old-school game music tracker for an ample variety of systems.
1BITDRAGON - 1BITDRAGON is a user-friendly music creation software that allows anyone to make music without having to be an expert or have thousands of dollars of gear.
FamiTracker - FamiTracker is a free windows tracker for producing music for the NES/Famicom-systems.
Jummbox - A modified Beepbox that have more stuff then Beepbox. It can be used just like Beepbox. The features of Jummbox is the same of Beepbox's features, but Jummbox have more stuff to offer.