The Planet Texture Generator allows you to quickly create a wide variety of planets with little effort. Easily adjust terrain, water, clouds, city lights on the night side of your planets and add snow to your planets poles and mountain tops. When finished adjusting your planet, bake your textures at up to 8192 × 4096 resolution, which can later be edited in your favourite image editor.
Includes a compute shader to speed up generation (Windows only) as well as full source code.