The Jetsons Movie and We're Back have both had a DVD release in widescreen.

Spielberg's "Family Dog"series has not come out on DVD, although the pilot episode was originally an Amazing Stories installment.

Heavy Metal has long been on DVD and the Blu Ray is terrific. There are some very minor differences in the soundmix, but it's unlikely a stereo soundtrack recorded off cable prior to the official 1990's video release exists. The Japanese Laserdisc is open matte.

Beavis and Butthead Do America has also had a nice DVD release.

Cat's Don't Dance has only come out on DVD in full frame.

There are a couple other anime or family films I could add to the list soon as I'm done sorting out my LD collection.