GNU Solfege - GNU Solfege is free music education software.
Perfect Ear - A simple yet advanced application for improving your solfege 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.