
You can find a list at the openculture.com website, beside other lists of free movies:
https://www.openculture.com/free_hitchcock_movies_online
For the ultimate Hitchcock-fan, there's the 13,5 hour audio archive of the interview of Hitchcock by Fran�ois Truffaut: "Alfred Hitchcock long interview - with Fran�ois Truffaut", which was the basis of the eponymous book from Truffaut. As usual at the Internet Archive: https://archive.org/details/AlfredHitchcockLongInterview-FranoisTruffraut