untrunc - Restore a truncated mp4/mov. Improved version of ponchio/untrunc
ChordIQ - Learn notes, chords, sight reading, perfect pitch and more.
Digital Video Repair - Digital Video Repair is freeware to repair (fix) MP4, MOV and AVI files having problems with playback or rewinding.
7Pad Scales and chords - Music instrument and assistant for playing scales and chords.
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!
muted.io - A magical collection of interactive music theory tools & visual reference pages for musicians and music producers