Data Transfer is an extension to MediaWiki that allows users to both export and import data from and to the wiki, via XML files. The extension makes light use of the Semantic MediaWiki extension, but it does not require the presence of SMW. Still, in spirit the extension could be considered a member of the Semantic MediaWiki "family", since it has the same data-centric approach to wiki content used by SMW and spinoff extensions like Semantic Forms.
ratman is a minimalist skin for MediaWiki-driven websites. Originally developed by Jason Pearce, users began making enhancements and fixing bugs. To better facilitate community-driven development of this popular skin, the project has moved to Google code.