OpenBOR is a continuation of the Beats Of Rage 2D game engine, which was originally created by the wonderful folks over at Senile Team. This is the 3DS version.
In 2004, Senile Team released Beats of Rage, a free beat-'em-up for DOS inspired by SEGA's Streets of Rage series and using sprites from SNK Playmore's King of Fighters series. The game spread only by word of mouth, but it nonetheless amassed popularity very quickly. Senile Team soon released an edit pack allowing anyone interested to create a module for the BOR engine.
In 2005, Kirby2000 asked Senile Team to open the source code to BOR. They agreed, and OpenBOR was born. Development on the engine was continued by the community, and still is to this day.