Board Thread:Support Requests - Getting Started/@comment-11008902-20140725234944/@comment-11733175-20140726002300

ShoutWiki offers private wikis, although I believe they come at a cost. It's the same base software that Wikipedia and Wikia run on (MediaWiki) although it won't have many of the extensions Wikia offers.

It does keep more up to date with MediaWiki releases last I looked so you may find they could offer something similar to what Wikia offer already or in the near future as variants of Wikia's ideas are slowly being proposed on MediaWiki. Examples of such are Flow, similar to Message Walls and Article comments and Phalanx, an anti-vandalism extension that was backported to work with core MediaWiki some time ago.