They Are Billions

Game description:

Distant future. Almost the entire population of Earth has been wiped out by a zombie apocalypse. The mutants are still wandering the ruins of cities that used to thrive searching for rare survivors. You are going to build and run a settlement that hosts several thousand people who try to stay alive and avoid catching the infection. To do that, you have to take care of many things, distribute responsibilities between the colonists and make sure the base is well-protected by looting abandoned buildings and warehouses for all possible supplies.