In the beginning everything was free. Well, at least on the internet. Today you can purchase movies, books and a lot more online. But a few things are still free. Old movies and books where copyright has expired or the creator just set it free.
Open Culture lists hundreds of free movies and ebooks. There are more than that there, just go and see. You will find movies by Hitchcock, Fritz Lang, Warhol, Kubrick, Cronenberg and Tarkovsky. Classics, unknown and old movies like the 39 Steps, Solaris and Plan 9 from Outer Space. You’ll find a movie about Alan Turing, one about Titanic and then 700 other movies.
That’s a good start, you’ll find more at