OpenOMF is a Open Source remake of "One Must Fall 2097".

In the year 2097, steel will bend and sparks will fly as you control
a 90-foot robot in a futuristic fight of Epic proportions.
OMF 2097 will rip your heart out with full screen, ultra fast
fighting action.

One Must Fall: 2097 adds an entirely new dimension to the fighting
game genre. In OMF's "Tournament Play," you enter the arena as an
inexperienced 98,000 pound weakling. Fighting through match after match
of opponents, you earn cash and experience for every fight you win.

You can use this cash to enhance your robot to new levels of strength.
After many fights, your power will reach nearly unbeatable levels--or
so it seems. At the end of each tournament you'll contend with an
ultra-powerful boss robot.