Strange Aeons is a skirmish wargame of Lovecraftian horror. You can get a Strange Aeons demo kit here, and the quick reference sheet for the second edition Strange Aeons here.
rules
Inquiry, Inc. Mystery Rules
Inquiry, Inc. is a set of free rules for playing games with Hasslefree’s not-Scooby figures.
Zombie Plague Rules
Fortress Figures offers “Zombie Plague”, a set of free wargames rules for horror scenarios. The free game goes with their excellent (and humorous) zombie plague figures. Check them out.
Run Or Shoot?
Run or Shoot is a set of free wargames rules for Zombie survival horror games.
Dunwich – Cthluhu Mythos Miniatures Rules
Dunwich is a set of free wargames rules for skirmishes set in the Lovecraft Cthulhu Mythos. Its based on the Dr. Who Miniatures rules sets.