A port of Beats of Rage and the enhanced OpenBOR for the gp2x (a good fighting engine).
You can get a lot of mods here.
It has already been tested with some of them
Lot of improvements and the gp2x version now use the Upper memory
http://www.gp2x.de/cgi-bin/cfiles.cgi?0,0,0,0,20,2302