Hover Carnage

"Hover Carnage is a multiplayer 3D action/strategy game for Linux and other Unix variants. Controlling a hovercraft vehicle with a variety of projectile weapons, you are thrust into a world where players speed through subterranean tunnels, delivering valuable payloads of raw matter and information. Whether you choose to become an armored courier yourself or partake in activities a bit more disruptive is completely up to you. - HoverCarnage"

http://hover.sourceforge.net/authors/