EDGE

EDGE (Enhanced Doom Gaming Engine) is a collaborative Open Source project based upon the [Doom source code]. EDGE derived from an earlier project called DOSDOOM.

The most attractive feature of EDGE is its DDF system. DDF describes all game behaviour inside text files external to the executable file. As a result, it is popular among modders who use the extensibility to add many new weapons and features with many fewer of the limits present in other source ports.

EDGE includes ports to many popular Operating Systems, including MS-DOS, Microsoft Windows, Linux, BeOS and Mac OS X. It has both software-rendered and OpenGL hardware-accelerated versions.