Odamex is a free and open source port for the classic
first-person-shooter Doom. Odamex's goal is to emulate the feel of and
retain many aspects of the original Doom executables while offering a
broader expanse of security features, personal configuration, gameplay
options, and editing features. Odamex can run on a wide range of
operating systems and hardware, so players should be able to play
on almost any platform.