Beats of rage comes back to the PSP:

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 modifiable game engine made by Senile Team and inspired by Sega’s classic Streets of Rage series. The term “modifiable” 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”.