I hadn't seen this posted here before, but it's likely to have made an appearance.
If you're unfamiliar, it's a tool for the d6 game Stars Without Number. This fame has, easily, some of the best tables and tools for randkly generating planets, moons, etc.
Now, of course you needn't roll on the tables, but should you elect to, or not, they make pretty surprisingly solid locations. This online tool rolls on the game's tables and generates an entire sector.