Referata is not available for MediaWiki but there are some alternatives with similar functionality. The best MediaWiki alternative is Wikipedia, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Referata and six of them are available for MediaWiki so hopefully you can find a suitable replacement. Other interesting MediaWiki alternatives to Referata are Miraheze, BlueSpice for MediaWiki, Citizendium and ShoutWiki.
Free content, multilingual online encyclopedia written and maintained by a community of volunteers through a model of open collaboration, using a wiki-based editing system.
Miraheze is a 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.
BlueSpice is your tool for documentation and centrally collecting and sharing knowledge. BlueSpice turns Wikipedia’s popular software engine MediaWiki into a fully-fledged EnterpriseWiki solution.
Citizendium, powered by MediaWiki, is "an open wiki project dedicated to creating a free, comprehensive, and reliable repository of structured knowledge". Unlike with Wikipedia, a contributor must register using their real name and verify their identity.
ShoutWiki is a free, ad-supported wiki hosting company that offers hosting support to individuals, companies, schools, universities, as well as a diverse range of communities. MediaWiki is the syntax of hosted wiki-sites.
A free wikifarm project allowing to keep private wiki and build it up through MediaWiki syntax.
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It is an encyclopedia wiki, not a wiki garden/farm or a wiki software.