Fandom - The entertainment site where fans come first.
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
Wikiful - Wikiful is an online platform that makes it easy to build and share a wiki.
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Editthis - A free wikifarm project allowing to keep private wiki and build it up through MediaWiki syntax.
HandWiki - HandWiki is an online encyclopedia for collaborative editing of articles dedicated to applications of computers, software and programming in science and technology