Nepelton

An Openly-Hackable FPS Game for School.

Nepelton is a FPS game built for High School Students wanting to shoot stuff and play a video game in the "comfort" of High School. This is based off of the cube engine. It is currently in testing and heavy development but will be out soon enough (presumably late as late October and early as mid September).
This game is based off the Assault Cube engine but with some mods here and there.
Also I chose Assault Cube because it has no cheat protection, so if you want to hack (now it is easier), you need to know a bit of C++ and a little bit of software and it is all ok with the servers.

Nepelton Web Site