Bio Hunter, Biohazard: Degeneration Recommendations
Both titles are horror action-packed anime with a similar dark tone and atmosphere. They both involve protagonists who are investigating a cause of an evil deadly virus that can turn people into monsters. Both anime are quite violent as well. The main difference between the two is that Bio Hunter has demons while Resident Evil: Damnation has zombies. If you enjoyed one, you'd probably enjoy the other.