>AssaultCube http://assault.cubers.net/ Easy to get into, in my opinion the closest you can get to a FPS+MOBAs while still making a good game. Past its golden age apparently, some speedbots here and there.
>Xonotic http://www.xonotic.org/ Fun as all hell with people, bots are good for getting a hang of it. Mods expand on it with vehicles. Bring your friends.
