I was actually specifically thinking of a MediaWiki instance. In this case there wasn't a codebase to version control so I didn't think of github and gitlab as options but maybe that makes sense. I don't know about tiddlywiki -- does that work for collaboration? It says "personal web notebook" so I sort of assumed it wouldn't have the multi user admin setup that mediawiki does.

> what about the free github and gitlab wikis

Make no mistake: those are not wikis. Just because someone (or a company) uses the word "wiki" when describing something, that doesn't make it a wiki.

Perhaps you don't understand what a wiki is, but there are hundreds or more implementations of every reasonable etymological interpretation of the term. If you have a particular narrow version of it, that's not universal or helpful.

I hope you'll consider being more obnoxious and weaving even more non-sequiturs through your next comment.

Try the SharePoint wiki for a laugh.