Wapedia - Education & Reference
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
Citizendium - A wiki for providing free knowledge where authors use their real, verified names.
Fandom - The entertainment site where fans come first.
Wikipedia - Wikipedia is a free online encyclopedia, created and edited by volunteers around the world and hosted by the Wikimedia Foundation.
Wikiful - Wikiful is an online platform that makes it easy to build and share a wiki.