Why not try out this mod for ARMA II:
http://www.dayzmod.com/
Quote:
A 225 km2 open world post-soviet state and one of the areas hit by a new and presently unknown infection which has wiped out most of the world's population. You are one of the few who have survived and now you must search this new wasteland in order to fight for your life against what is left of the indigenous population, now infected with the disease.
Go Solo, team up with friends or take on the world as you choose your path in this brutal and chilling landscape using whatever means you stumble upon to survive.
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Still an open alpha, but free to download and really, really enjoy.