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Dispatch → Meta → Reference
Worldbuilding resources for fun and profit
A guide to mapping with paint.net, though seemingly quite transferableNice mountains in Photoshop (should work in GIMP too, I haven't tested it yet)
A load of questions to consider to help you develop your nation
Random generators, though more tailored to a medieval/fantasy setting
One page from there in particular, with useful mapping resources
r/worldbuilding's resources list
Grammars of not one, not two, but 1,362 languages
First tutorial on applying the CC to a world
Second tutorial on applying the CC
Some other climate-related tips that I had bookmarked for some reason
NASA's very own g-projector, for converting between map projections
Tutorial on good country design
Same site, dealing with cities
Software to develop climates based on terrain - there is a free version
Flag designer, browser-based or downloadable for free with more features
Designing continents from scratch
A diagram for determining climates the easy way
Possibly the single best page on the internet for designing a whole planet
A collection of map tutorials, as well as some biome guides
A satellite map tutorial for Photoshop