Braindead/Dead Alive (Directed by Peter Jackson)
Bad Taste (Directed by Peter Jackson)
Planet Terror (Directed by Robert Rodriguez)
From Dusk Till Dawn (Directed by Robert Rodriguez)
Tokyo Gore Police and Ichi- The Killer
all of them were already mentioned.
I would add two more who are a bit overlook.
The 2007 French Splatter/Slasher À l’intérieur / Inside. This Film is not only very gory and disturbing, it has also great storyline and is really suspenseful.
The 2008 Horror The Midnight Meat Train directed by Ryuhei Kitamura and based on a short story from Clive Barker. This Film has a very interesting setting and a great Storyline and many Blood and Gore with Bradley Cooper as the Lead and Vinnie Jones as a evil butcher villain. One of my favourite films.