EarMaster - Professional software for ear training and practical music theory on Windows and Mac.
MixPad - MixPad is free music Music Mixer and Recording software designed for easy audio production.
GNU Solfege - GNU Solfege is free music education software.
Audio Video Editor and Mixer - Audio Video Editor and Mixer is a tool that helps you add changes to your video and audio files.
Meludia - Listening exercises and to sharpen your ear and music theory skills
Add Audio to Video - Add Audio to Video empowers you to add custom audio tracks to your video files.