Violence and gore tend to go hand in hand (not necessarily, though.) Not listed by how good the anime is; this is listed by the amount of violence and gore. This has nothing to do with my "Horror" lists--I do not consider gore scary.
I don't want to spoil anything here so I won't mention much about the series individually.
This list consist of a few carefully selected series from different genres that I believe are some of the best within their specific genres.
(Note that I...