Quote from github:

OpenOMF is an Open Source remake of "One Must Fall 2097" by Diversions Entertainment. Since the original DOS game from 1994 uses IPX networking and is a pain to set up, the community needed a better solution to keep playing the game we love. Together with networking, we try to make it easier to play One Must Fall in its original glory on multiple platforms (Linux, Mac OSX, Windows, BSD to name a few).

For more detailed information about the project, please see http://www.openomf.org/