Listening Ear Trainer - Listening Ear Trainer has 2 methods to improve your pitch recognition skills. The Singing Funnel Method lets you sing notes with increasing precision. The Octave Anchor Pitches Method builds a repertoire of notes, which increases with each exercise.

Flowkey - The easiest way to learn piano with your iPhone or iPad

Pitch Ability Test - Test your Pitch Ability. Measure your pitch take over and pitch retention abilities. Know where you stand on the road to Absolute Pitch. Especially, measure the criteria: Accurately sing a named note without a reference.

Yousician - Learn to play music at home, at your own pace

EarMaster - Professional software for ear training and practical music theory on Windows and Mac.

Melodics - Melodics is a desktop app that teaches you to play MIDI keyboards, pad controllers, and drums.