Earth 3D for Unity game engine

Earth 3D by Unity3dx is the best Earth/Planetary shader money can buy for a real time 3d engine. It represents hundred of hours of test, and tweaks. You get more than 14 prefabs, 9 different planet scenes, 7 different shaders, scripts, and textures. You also get a 10 pages user manual with description of the parameters and the shaders.