NtEd - Music Score Notation editor.
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Sibelius - Sibelius is a virtual score creation tool which allows composers to easily create new piano scores, developed by Avid.
Meludia - Listening exercises and to sharpen your ear and music theory skills
tonica fugata - Composing it for you... Automatic three and four-part composition (styles: J.S.
GNU Solfege - GNU Solfege is free music education software.