NtEd - Music Score Notation editor.
Meludia - Listening exercises and to sharpen your ear and music theory skills
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
GNU Solfege - GNU Solfege is free music education software.
tonica fugata - Composing it for you... Automatic three and four-part composition (styles: J.S.
Perfect Ear - A simple yet advanced application for improving your solfege skills.