Online Editing Tools:
WeVideo offers a free basic subscription.
FileLab Video Editor requires a plugin.
Music Tracks:
Lots of free music in the Free Music Archives: Thumbs up!
Smart Sound: you have to hunt for the free music, but it’s there. Somewhere.
MobyGratis: need to make an account, and wait for approval but hey, it’s Moby!
Jamendo is cool, too.