SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
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.
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.
FL Studio - Image-Line's FL Studio, now on it's 12th version, is a well-known music production suite and the most popular beat processor on the market, due no doubt to its longevity. Read more about FL Studio.
NanoStudio - NanoStudio is a recording studio for iOS, OS X and Windows.
iMaschine - iMASCHINE puts professional groove production in the palm of your hand.