Jeroen De Dauw
Wikidata is a free knowledge base that can be read and edited by humans and machines alike. It centralizes storage and management of Wikipedias structured data and provides access to it in various open formats. It is powered by the Wikibase software, which is build on top of the MediaWiki platform.
Note that the slides are generally not designed for after-talk usage. However, they are useful when watching the recording of a talk.