Who Uses MediaWiki?

in relation to https://phabricator.wikimedia.org/T951 this is a start to document who uses MediaWiki.

http://wikistats.wmflabs.org/display.php?t=mw&s=users_desc

http://trends.builtwith.com/websitelist/MediaWiki

https://wikiapiary.com/wiki/Websites

http://semantic-mediawiki.org/wiki/Wiki_of_the_Month