Features you don't want to miss:
Exercises with various degrees of difficulty: ascending, descending, random and simultaneous intervals
NEW Selection of intervals for your exercise: all, weakest and custom
Learning progress indicator for the overview of your abilities, displaying the average of the last and all-time exercises
Get reminded of your daily exercise in order to get a steep learning-curve
ChordU - Extracts chords from any song, integrated YouTube.
EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Guitaa.com - Turn ANY song into chords, play along with interactive chords and diagram, transpose, loop, tempo control.
Meludia - Listening exercises and to sharpen your ear and music theory skills
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.
LenMus - LenMus is a free program for learning music.