The map will drawn in openGL, and the planets will be mapped spherical objects (with some dents for some planets).
I’m planning to use mapzone as the texture editor for planets.
Mapzone is a free, nodal, texture generator, that can allow me to create several planets just by tweaking some numbers.
I will create some presets so you will be able to play with it, and you will be able to submit me some of your art if you have contributed !