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.
SunVox - SunVox is a small, fast and powerful modular synthesizer with pattern based sequencer (tracker).
GarageBand - GarageBand is a fully equipped music creation studio for Mac
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.
Cubase - Cubase is one of the world’s most powerful music creation software packages. From first idea to finished recording, Cubase helps you to make outstanding music.
MOTU Digital Performer - Get inspired, then refine your mix — all in a singular workflow.