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The Cartographers’ Guild is a forum created by and for map makers and aficionados, a place where every aspect of cartography can be admired, examined, learned, and discussed. Our membership consists of professional designers and artists, hobbyists, and amateurs—all are welcome to join and participate in the quest for cartographic skill and knowledge.
Although we specialize in maps of fictional realms, as commonly used in both novels and games (both tabletop and role-playing), many Guild members are also proficient in historical and contemporary maps. Likewise, we specialize in computer-assisted cartography (such as with GIMP, Adobe apps, Campaign Cartographer, Dundjinni, etc.), although many members here also have interest in maps drafted by hand.
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I made it in GIMP. I was messing around one day, found a script that came with GIMP and decided I would rather have something instead of nothing, so did a bit of tweaking to the output and poof.... In GIMP, on the Xnts->Misc->Planet Render menu, this opens a window where you can set the base planet color, amount of darkness, direction of the light,etc. I found something I liked and then I did a selection and added some fog (with a filter plugin I found on the web somewhere) to add some "clouds". Let me know if you need any more help than that.