This is more of a game engine/level editor, it has a really lame campaign with absolutely no storyline, but you can go split screen in multiplayer if you set up a server, which is why I'm wondering if I should or not.
Sauerbraten is a FPS game and you can either choose to kill each other or to kill computers in it. but I think the best thing about this game is the level editor:
The level editor allows other people to join in on editing the map through the server. The game is open scourced so if you have a 3d modeling program, you can just make something and put it into Sauerbraten.
If anyone is interested in this, please just reply, this game is for Mac, PC and Linux
the downloads are here:
http://cubeengine.com/files.php4NOTE: it takes awhile for the installation to start up, so don't try running the setup more than once at a time.