EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
MusicTrans - MusicTrans is a powerful learning tool for playing any song.
Meludia - Listening exercises and to sharpen your ear and music theory skills
Audioalter - Your online audio toolkit. A collection of easy-to-use web tools for all your audio files
GNU Solfege - GNU Solfege is free music education software.
Transcribe - An online app that reduces the pain of converting audio & video to text. Saves thousands of hours every month for journalists, lawyers, students and professional transcriptionists all over the world, including researchers in Antarctica.