Cataclysm

Cataclysm is a zombie apocalypse-themed roguelike survival game developed in C++ by Zachary "Whales" Jenkins, and released under the Creative Commons Attribution-ShareAlike 3.0 Unported license. It is no longer being actively developed. A fork of the game, titled Cataclysm: Dark Days Ahead, was started by fans of the original Cataclysm and continues to see frequent development.