Constant Noble:Semantic MediaWiki
Semantic MediaWiki—an advanced version of the MediaWiki software that allows for better management of data than the regular counterpart—was touted as the key selling point of Yaron Koren's now-defunct Referata network (on which this site's founder was an administrator and ran four separate wikis). On semantic sites, users can store, organise and edit items with features such as properties, types and forms. Data can even be queried, thanks to the "Special:Ask" function.
SMW has been occasionally proposed for installation on Miraheze, but turned down each time due to Referata already offering it (before 2020–2021), infrastructure/performance concerns, and as of June 2021, incompatibility with MediaWiki 1.36. Although Koren's Cargo has been widely suggested in its place, the new Constant Noble site has instead adopted DynamicPageList3 as the closest perceived substitute to SMW.
Version 3.2.3 of Semantic MediaWiki was released in late March 2021; meanwhile, MediaWiki on Miraheze is currently on version 1.36.2 (8aab6ea).