One of the most influential B-movie filmmakers, my first exposure to his work was his 1981 Halloween clone Bloody Moon, which focuses around girls being killed at a language school in Spain by an unknown assailant. But Franco had directed nearly 200 films during his career. Although a lot of critics and peers would sometimes discredit his work -- or deride his films as "rip-offs," and perhaps some of them were -- many were entertaining films, worthy of viewing. Some of them could even be inspirational pieces of art. I always found his films to be a bloody good time.
Some of Mr. Franco’s other work includes Oasis of the Zombies (aka Nazi Bloodsucking Zombies), Ilsa the Wicked Warden, Devil Hunter and, probably the most notorious of his work, Vampyros Lesbos.
Check out any that you can get your hands on and see for yourself how someone can make the best film possible with low budgets and time restraints. Mr. Franco will forever be remembered as one of the most notorious film makers in history.