Does anyone know if there is any sw that has football players prebuilt, but can be modified and put into a simulation? We are devlopiing a new sport that combines martial

arts with football, american style and would like to  show the world how it works through game simulation. Oh yes, we need horses too, and archers...

please help!

American football not sure but, with some changes you might use soocer example from programming game AI by example:
https://github.com/wangchen/Programming-Game-AI-by-Example-src