Pharyngula

Galaxiki

It’s a wiki with the tagline, “It’s a fictional world purely imagined by its community”, and it isn’t Conservapædia! Galaxiki is a galaxy-building exercise that lets you create star systems and populate them with stories and details. One bummer is that they charge you for the right to create new stars — that doesn’t seem like a smart idea, since you’d think they’d want more contributions, at least early in the game — but you can edit somewhat freely, and there are swarms of randomly generated star systems to play with.