no, nothing like it actually exists. and is popular right now.

they tried to have a rip off of halo in some Massive Multiplayer First Person Shooter, forget what it was called though...planet side? i played a tral version of it a looong time ago...like 2001 or maybe 2002. everything looked like halo 1 though, the warthog looked the same, you could fly this pelican rip off. but in general the game sucked. and it was never really all that popular.

it would be freaken sweet if they make halo 2 massive muliplayer online. i don't mean team matches either, i mean you can travel alone, join up with people in a part, go out, raid... the blue team...basically fight a massvie civil war between red and blue...