Digital Video Repair - Digital Video Repair is freeware to repair (fix) MP4, MOV and AVI files having problems with playback or rewinding.
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers
Restore.Media - Got a corrupted video or audio file? No worries – Restore.Media can repair even the most severely damaged video and audio files where other tools fail. Try it free!
Scale Heaven - Browse and play any scale/chord, chord progression.
iLike Free Photo Recovery - Recover Deleted Photos, Videos and Audio Files
Chordify - Chordify turns any music or song (YouTube, Deezer, SoundCloud, MP3) into chords.