Wikibase is a system for storing and querying structured data that powers Wikidata.

Wikibase consists of two extensions:

  1. Wikibase Repository that allows a wiki to work as a repository for structured data.
  2. Wikibase Client that allows a wiki to access structured data from the repositories.

Wikibase installation instructions at Mediawiki.org

More information about Wikibase at http://wikiba.se/.