MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
Bosca Ceoil - A free, easy to use tool for creating music.
OpenMPT - OpenMPT is a popular tracker software for Windows.
Zynewave Podium - Podium is a modern digital audio workstation (DAW) for Windows.
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.
Renoise - Renoise is a digital audio workstation.