OpenBOR (Open Beats of Rage) is an open source engine to play Beats of Rage.
Beats of Rage is a freeware open source video game and moddable game engine made by Senile Team ( http://www.senileteam.com/beatsofrage.html ) and inspired by Sega’s classic Streets of Rage series. The term “moddable” means that the program allows users to create their own content, and thus their own beat-’em-up game, which is then called a “mod”.
Beats of Rage was first made available for download November 2003. It was not advertised in any way other than by word of mouth, yet it soon gained enormous popularity.