Miraheze is described as 'Wiki farm (hosts wikis) for free and with no ads, it also provides custom domains, extensions and many other features. It is based on MediaWiki' and is an app in the education & reference category. There are more than 25 alternatives to Miraheze for a variety of platforms, including Web-based, Self-Hosted, Android Tablet, Android and MediaWiki apps. The best Miraheze alternative is Ibis Wiki, which is both free and Open Source. Other great apps like Miraheze are BookStack, PCGamingWiki, Fandom and Scholarpedia.
UserPress is a wiki plugin for WordPress offering sophisticated functionality wrapped in a simple, intuitive interface. UserPress allows users to edit and create content using your front-end theme (as opposed to the wp-admin area), much like Wikipedia.
Australia
OpenFiction is a spoiler-safe encyclopaedia for fiction, built entirely by readers who know their series inside out. Every character, every appearance, every connection - contributed and verified by people who've read every page.
United Kingdom
