Cube – This looks like an interesting game. It’s got some pretty screenshots and the blurb makes it look appealing.
Cube is an open source multiplayer and singleplayer first person shooter game built on an entirely new and very unconventional engine. Cube is a landscape-style engine that pretends to be an indoor FPS engine, which combines very high precision dynamic occlusion culling with a form of geometric mipmapping on the whole world for dynamic LOD for configurable fps & graphic detail on most machines.
I won’t pretend to know what all that means but I’ll give it a whirl over the weekend!
Here’s the linuxgames.com review that pointed me towards this game.