Wikia

Wikia used to be Wikicities. Wikia provides free web space for online and offline communities who want a Wiki and are prepared to release copyright for what they write on the Wiki. In late 2006 it was claimed Wikia pages had been viewed 40-50 million times. Wikia has grown since then. Specialist Wikis within Wikia accept contributions that are unsuitable for Wikipedia. Wikia already has a fiction wiki, several wikis dedicated to different role play games, cookery wikis and more and more and more. If a user logs in with one wiki on Wikia that user is automatically logged in with the same user name on all of them.

Reference

 * [Wikia