Semantic MediaWiki (.org) (SMW) is a free, open-source extension to MediaWiki that lets you store & query semantic data within the wiki and it seems well suited to Consumerium's information infrastructure needs.
A variety of open-source MediaWiki extensions exist that use the data structure provided by Semantic MediaWiki.
Among the most notable are of the Semantic MediaWiki extensions:
- Semantic Forms - enables user-created forms for adding and editing pages that use semantic data
- Semantic Result Formats - provides a large number of display formats for semantic data, including charts, graphs, calendars and mathematical functions
- Semantic Drilldown - provides a w:faceted browser interface for viewing the semantic data in a wiki
- Semantic Maps - displays geographic semantic data using various mapping services
- Database for a higher level view of what is going on with the databases
- DBpedia the original structured data harvesting effort for the MediaWiki wikis
- Wikidata and the underlying Wikibase extension