Reanimation Zombie Survival Card Game

Reanimation is very highly rated at Board Game Geek. And it is free.

Dice of the Living Dead

Dice of The Living Dead is a free print-and-play zombie survival horror game.

Cthulhu: The Great Old One Card Game

Cthulhu: The Great Old One is a simple, free print-and-play card game.

BioSyndrome Zombie Survival Horror Game

BioSyndrome is a community created game of zombie survival horror.

Zombie Enclave Solo Board Game

Zombie Enclave is a free print-and-play solo boardgame of the Zombie apocalypse.