Miraheze is a free, non-profit wiki hosting service that uses MediaWiki version 1.33 as its hosting engine, and commits to upgrade to the most recent stable version. Miraheze auto-installs several MediaWiki extensions on new wikis, and will install most extensions at the request of the user who set up the wiki, including VisualEditor and Flow. Miraheze is supported by user donations and does not include any advertising on wikis it hosts.
Miraheze currently hosts nearly 3000 wikis.
Miraheze can download any MediaWiki extension, at the request of the operator of the wiki, provided that it passes a security review. Many of these can be found at Wikimedia's Git code repositories. To see extensions that are currently downloaded on Miraheze see their github.
There are also Extensions by Miraheze, available as free open source software.
If requested, Miraheze provides support for custom domains, but under some conditions.
Miraheze uses open-source code, and hosts it at GitHub.
Extensions, settings and permission management
Miraheze uses their own extension, called ManageWiki in order to allow users on individual wikis to enable/disable extension, change a variety of settings (their logo, their favicon, etc.) and also to change permissions using the ManageWiki extension.
Miraheze uses their own Phabricator for issue/bug reports as well as requesting some features for wikis.
Sample Miraheze Project: Developing a collection of Calculus problems
In the Spring of 2017 Calculus students at WSULC will be assigned private wikis where they will copy these problems, solve them onto image files and modify the wiki-text to create similar problems, taking inspiration from the textbook, but taking care not to commit plagiarism (equations cannot be copyrighted). Four exams will be constructed:
Student solutions and newly posed problems will be added to these questions as the semester progresses.
All the Tropes
In late 2013 a wiki called All The Tropes, in response to concerns of relicensing TV Tropes, forked all of TV Tropes' content and moved it to a wiki hosted on Orain.org. After Orain.org was compromised, a backup of AllTheTropes.org content was imported to Miraheze. Authors of the fork attributed to TV Tropes managers several actions of taking commercial rights over what is published on its website, censorship, and failing to comply with the original license.
Wright State Lake Campus Miraheze/Wikiversity effort
Miraheze currently functions with 19 different servers used for different purposes (MediaWiki, Varnish, Database, Puppet, Test, Bacula, Lizardfs, Misc, etc.). A list of these servers and each of their functions can be seen here.