FreeGameDev

Not much to ask! I've used Wikispaces before and it's alright, but gets covered in adverts (which I imagine most of them do since they're free). Does anyone have any recommendations?

Wikia although that also is a bit ad-laden.

To be honest, Google code wiki is reasonably good, or the hosted apps mediawiki on Sourceforge.

Charlie already mentioned http://wikia.com, http://sf.net and http://code.google.com
I can recommend http://github.com in addition.
You can also check this list: Comparison_of_open_source_software_hosting_facilities@Wikipedia

But I'm drifting away, you asked for wiki hosting and I give you project hosting...

I have used http://wikidot.com before and found it's editing interface bloated/slow, now they also have a blogger-like bar at the top of every page. Wikipedia helps again though: http://en.wikipedia.org/wiki/Comparison_of_wiki_farms

Google Code! Why didn't I think of that when I already have the project hosted there! D'oh.

Actually I was thinking, "Why isn't he using Google Code? Maybe it doesn't do what he wants..."

I mentioned it anyway just in case.

Unfortunately, it doesn't. I want anyone and everyone to to be able to edit it, and Google Code's WIki only allows specific people.

I might write my own so I can then integrate it directly into the Stellar Forces website.

I wouldn't write your own. Surely you can integrate one of the many Java-based wikis out there.

Wheel, reinventing...

Good point, but I often find it's quicker to write something like that to my own specification than to try and work out how an existing system works, integrate it and then change it to my specification.

A little late here, but I'll just mention that it is possible to give certain people just wiki permissions on Google Code. Add the person to the "Project contributors" list and then set their specific permissions by navigating to the user in the "People" tab.

Obviously you can't give everyone wiki permissions, but you could give it to anyone who requests it without giving them anything else and I don't think that is half bad. Google is unlikely to allow anonymous editing here since Subversion is used to store the wiki (which has advantages and disadvantages).

I've gone with DokuWiki now, which so far seems great. I can easily link it to my MySQL server to validate logins, so I don't need to do anything else when a login in my system is created in order to allow them to log into the wiki.