The recent Mexican film We Are What We Are, currently being remade by Hollywood.
Lots of Italian films in the wake of Cannibal Holocaust, like Cannibal Ferox and Eaten Alive.
before Alive, the 70s Andes plane crash was the inspiration for an exploitation quicky called Survive.
A quirky 80s cult film called Parents.
The black comedy Eating Raoul.
John Water's Desperate Living.
The 70s Ivan Reitman Horror comedy Cannibal Girls.
The Texas Chainsaw Massacre.
There are several films about The Donner Party, a particularely gruesome chapter of the American West, the best being a PBS documentary by Ric Burns. The British film Ravenous is also losely based on it.