The game engine I've been working on with a friend of mine is starting to shape into something real finally. The first video is the most recent, running custom per-pixel lighting and texture shaders (written in glsl), and software shadows. The second video was taken when camera controls were put in, the shaders weren't done then so the models are just flat shaded.
Thats just a preview of a proof of concept game I'm developing with the engine. The engine itself is cross platform (linux, windows, mac).