It procedurally generates infinite persistent terrain. It currently features a heightmap algorithm based on perlin noise, textures dynamically blended based on slope and altitude, per-pixel lighting and multiple layers of detail and normal mapping. I've also tried to create a realistic atmosphere and day/night cycle. This will be a core technology in a game I have planned.
Playable Browser Demo (due to changes in chrome plug ins such as Panda 3D no longer work)