Galaxiki

I found an unusual online tool called Galaxiki. It is a wiki-based scenario when you can help build a galaxy. You sign up to create a star system with planets. Then you can share you solar system with everyone else online. It seems to be designed as a collaborate tool for SF fans and writers. I could see them sharing their planets as a way to connect people to their fiction. The only downside to this tool is that it costs money to buy a star. However, they do have community areas where anyone with a free membership can name and edit certain systems.