OAuth

You may be looking for one of the following

Using OAuth on Wikimedia sites
 * ext>Special:MyLanguage/Extension:OAuth|Extension:OAuth - extension which implements OAuth in MediaWiki
 * ext>Special:MyLanguage/Extension:OAuthAuthentication|Extension:OAuthAuthentication - extension which makes use of the OAuth extension

Obsolete
Wikimedia Foundation's 2013 plans around OAuth development. These resulted in the feature described by 


 *  - obsolete information about OAuth