There is no Maximo G+ frontend.
BYOAC user TOK created the legend in a post in this thread:
TOK posted in a thread called "Best Front-End" in September of 2008:
Full 3D walk-through arcade support, scrolling menu, movie support, Direct 3D acceleration of all 3DFX games, cheats menu, automated ROM revision forward and back to any version of MAME, LED support, hiscore.dat support in ALL versions of MAME with an automatic screenshot of high scores that can be shown as a screensaver if the user wishes. Best of all, it has built in XBOX 360 emulation, though its very slow at the moment. Games are *just* playable on a quad-core rig.