Silent Film Online is free, substantial

Ends up that the lost Hitchcock isn't the only silent film you can find online now. The American University Library now has a subscription to Silent Film Online, a database of streaming silent films. This isn't a tiny collection: it has heavy hitters like Nosferatu, Battleship Potemkin, and Metropolis.

If you're an active member of the AU community (student, staff, faculty, etc.), you are able to view these films at any time. That's over 150 hours of historically important silent films available at any time. This is an incredible resource!