EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
Meludia - Listening exercises and to sharpen your ear and music theory skills
LenMus - LenMus is a free program for learning music.
Auricula - Practice your sense of hearing and learn to identify intervals for your musical development.
KDE Minuet - Free music education software, thoughtfully designed to push your musical skills to the next level.
Better Ears - Better Ears helps you grow your musical skills and enhance your hearing capabilities.