It creates bitmaps that can be used as textures on spheres. I included some DoGA L3 files with it. Download DoGA L3 (it's free), load the planet model, apply the texture, and export the model as a DirectX file (.X format.) If you're new to DoGA, you might want to dowload L2 first and play with it. L3's help files are not all converted to English, but I'm working on it.
There are a dozen programs out there that can make .X spheres. Creating clever textures is much harder.
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TAZ
DoGA English home page
http://www.doga.co.jp/english
Some DoGA help files, tutorials, and resources
http://zircher.iwarp.com/doga/index.htm
One thing you will find out about game development, there is no silver bullet. You will never find one program that does everything. Besides learning the programming language, you'll need to learn something about 3D tools, 2D graphical editors, file formats, audio formats, audio tools, etc. Sometimes a team member or forum reader can help, but you'll need to get some background knowledge so you communicate and express yourself clearly. Search the web for some game dev glossaries and read up on game dev news sites.