Among the various possibilities offered by the custom firmware or only the Homebrew Enabler (HEN), there is certainly open to amateur utlitĂ* software or leisure. The latter category has been inhabited various productions play more or less valid. Among these is Revamped.
Revamped is a FPS for the PSP (and others) that re-construction amateur mechanics like that in a typical sci-fi graphics context that calls the universe of Halo (Xbox and PC hit series) which we can say which builds to full hands. The title is based on the graphics engine of the first Quake (ID Software) which, although labeled as "obsolete" PC, but is widely exploited with excellent results on the PSP, there are in fact the amateur productions born thanks to this open source engine for some time. In addition Revamped boasts an active community that ensures the continuous improvement of the project.