Corpse Craft is a beautiful and addictive video / flash game that combines a Tertris like puzzle with a building strategy game. In it, you accumulate the resources of blood, flesh, scrap and energy by completing a Tertis like puzzle. When you have enough resources, you can then unleash different types of Zombies to take down your mad scientist rival.
Xenotactics is a tactical science fiction skirmish wargame for 3 – 15 miniatures per player.
Akula’s Rules: Skirmish Edition is a simple set of free wargames rules for Zombie games. There’s also a set for mutant games.
Mythos Miniatures is a character driven skirmish rules system for adventures in the worlds of HP Lovecraft.