This is by no means meant to be an exhaustive list of video resources, but should provide a good sampling of useful starting points.
The majority of films in these resources date to the early and mid-twentieth century and have entered the public domain. A variety of genres are represented in these collections, from feature films to studio-produced short films to educational films and cartoons.
Be sure to review the copyright information on each of these websites before utilizing any of the content found there!