You want a list? You got it!
All Romero's Dead movies, the early Cronenberg stuff, recommendable Jap flicks: Ringu (not that bad US remake), Dark Water, Ju-On : the Grudge, Battle Royale, Ichi the Killer, Story Of Ricky, the list goes on Braindead, Bad Taste, Meet the Feebles, recommended Fulci: The Beyond (the one true cut, avoid all other titles), The House by the Cemetery, NY Ripper, The Gates Of Hell (aka City Of the Living Dead), others: Cannibal Holocaust (three decades before the Blair Witch Project ripped it off), The Hills Have Eyes, all Evil Dead movies, Henry : Portrait Of a Serial Killer, the original Texas Chainsaw Massacre, NekRomantiK
I can go on and on with this subject