Quote Originally Posted by qmslager View Post
Campaign Cartographer was mentioned but it is important to note that several of their add-ons can be used in multiple mapping programs to place art objects. And their add-on cosmographer is one of the only software programs that can build a galaxy for the sci fi enthusiasts. (If anyone knows of a better sci-fi galxy builder please list it, as I am always up for that challenge)
I can't vouch for it's utility since I have never used it, but nbos.com develops and sells AstroSynthesis which has abilities to map and create star systems, including some type of randomizing(as well as scripting) of body creation. I have also heard of several others, including some that are free, but can't remember the names off the top of my head.