Fandom - The entertainment site where fans come first.
You Need A Wiki - Create a wiki with Google Docs
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
Stack Overflow Documentation - A crowdsourced developer documentation
MyWikis - A premium wiki host with top-class quality, excellent support, and VisualEditor (a WYSIWYG...
Greenboard - Generate beautiful static api documentation