EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Abundant Music - Generate royalty free music with a simple but very powerful procedural music creator
Meludia - Listening exercises and to sharpen your ear and music theory skills
AIVA - The AI composing emotional soundtrack music
Perfect Ear - A simple yet advanced application for improving your solfege skills.
WolframTones - Listen to what I just found in the WolframTones music universe