Learn music theory & train your ears regardless of your musical experience. Solfej offers over 60 Practical lessons. No more Wikipedia/YouTube rabbit holes. New lessons added every month.
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
tonestro - Practice & improve on your wind instrument while having fun
Meludia - Listening exercises and to sharpen your ear and music theory skills
Piano2Notes - Piano2Notes is a web application and mobile that transcribes your piano tune into a digital word document.
Perfect Ear - A simple yet advanced application for improving your solfege skills.
Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.