EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
GEEKtyper - Code like in the movies
lightnote - An interactive site to learn the basics of music theory 🎶
Hacker Typer Access - Hacker Typer Access was developed and published by Seshat Studios for Android devices only.
Meludia - Listening exercises and to sharpen your ear and music theory skills
Hacker 101 (Prank) - Hacker 101 (Prank) is a fun app that is specially designed for those who want to become a hacker.