Qsynth - Qsynth is a simple Qt4 application wrapper for the ...
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
OpenMPT - OpenMPT is a popular tracker software for Windows.
MuseScore.org - Create, play back and print beautiful sheet music with free and easy to use music notation software MuseScore. For Windows, Mac and Linux.
MilkyTracker - MilkyTracker is an open source, multi-platform music application for creating .MOD and .
Finale - Finale, the world standard for music notation software, lets you compose, arrange, notate, and print engraver-quality sheet music.