Cataclysm: Dark Days Ahead (aka Cataclysm DDA or CataDDA) is an open source roguelike set in a post-apocalyptic and fictional New England. It's a continuation of Whale's original Cataclysm, which expands it with numerous new creatures, buildings, gameplay mechanics and many other features.
“ You emerge from the shelter into the dim light of an overcast day, and look around for the first time since the disaster. The world as you knew it is gone and in its place, a twisted mockery of all that was once familiar. Everything was cast aside in that frantic race for the shelter. You have no food, nothing to drink, no weapons. Nothing but your ingenuity and the fierce determination to survive against appalling odds. A grim prospect faces you. Perhaps worse even than the nightmares of last night, when you were tortured by dreams of the dead themselves rising to jealously tear life from the living.
You cast your eyes up the road and begin to walk towards a house in the far distance. Things may be bad right now, but you've got a sinking feeling that there are darker days ahead.