The best open source alternative to EarMaster is GNU Solfege, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to EarMaster and four of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to EarMaster are KDE Minuet (Free, Open Source), LenMus (Free, Open Source) and ScoreDate (Free, Open Source).
GNU Solfege is free music education software. Use it to train your rhythm, interval, scale and chord skills. GNU Solfege is an ear training program written to help you train intervals, chords, scales and rhythms.
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Most users think GNU Solfege is a great alternative to EarMaster.
LenMus is a free program for learning music. It allows you to focus on specific skills and exercises, on both theory and aural training. The different activities can be customized to meet your needs. It includes an score editor.
ScoreDate is your date with the music ! It is an open source software written in Java that helps musicians to learn music reading. It also helps you with ear training. It is suitable for any skill, from beginners to professional users. From slow training to first sight reading.