Evangelion is kinda violent, I have heard that Elfen and Claymore and berserk are also quite violent, and no doubt gantz and the like also have some violence, and kenshin has a different breed of violence.

I have to add Higurashi no Naku Koro Ni to the list as well as Berserk.

guyver is very violent

i'm not sure about the spelling.but it has to be "gantz".it was so violent it went past being vulgar.

Battle Royale, Gantz, Elfen Lied, Higurashi. Can't think of anything else with more gore right now.

from the ones i've watched , definitely elfen lied

最終兵器彼女 was pretty violent, and had a good story too

I think the English name was Saikano...

loool. come on. just watch this part from hellsing ova 7
here is video

srysly? i've seen almost every name mentioned here and i can say that other names are almost nothing in front of this - maybe because they seem dated. but here first they show how her family is killed and her dead mother raped. then she just goes and grinds that women's face off against the wall.
+ all the eating of people by nazis :cool:

P.S only thing that maybe is worth mentioning was Gantz. i loved those stupid jokes and just fuck it attitude.
i wish there was more violent anime. i really like it.