Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains, extensions and many other features.
Free • Open Source
What is Miraheze?
Miraheze is a free wiki farm, you can request your wiki which is 100% free and has no ads. The code of Miraheze is opensource (Github.com/Miraheze). You can change your logo, request extensions you need, and many other features. Help is provided via email, IRC, Phabricator.