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"KBpedia is a comprehensive knowledge structure for promoting data interoperability and knowledge-based artificial intelligence, or KBAI. The KBpedia knowledge structure combines six (6) public knowledge bases - Wikipedia, Wikidata, OpenCyc, GeoNames, DBpedia and UMBEL - into an integrated whole. KBpedia's upper structure, or knowle"

"Semantic MediaWiki (SMW) is a free, open-source ex­ten­sion to MediaWiki - the wiki soft­ware that pow­ers Wikipedia - that lets you store and query data with­in the wiki's pages. Semantic MediaWiki is also a full-fledged frame­work, in con­junc­tion with many spin­off ex­ten­sions, that can turn a wiki into a pow­er­ful and flex­i­ble know­ledge manage­ment sys­tem. All data cre­ated with­in Semantic MediaWiki can easi­ly be ex­port­ed or pub­lish­ed via the Semantic Web, al­low­ing other sys­tems to use this data seam­less­ly."

"Search engines, including web search engines, selection-based search engines, metasearch engines, desktop search tools, and web portals and vertical market websites have a search facility for online databases."

Wikidata aims to create a free knowledge base about the world that can be read and edited by humans and machines alike. It will provide data in all the languages of the Wikimedia projects, and allow for the central access to data in a similar vein as Wikimedia Commons does for multimedia files. Wikidata is currently in development.

Wikidata - the free knowledge base that anyone can edit

Wikidata is a project to create a free knowledge base about the world that can be read and edited by humans and machines alike. It will provide data in all the languages of the Wikimedia projects, and allow for central access to the data in a way similar to what Wikimedia Commons does for multimedia files.

Linked Data is a method to publish data on the Web and to interlink data between different data sources. Linked Data can be accessed using Semantic Web browsers, just as traditional Web documents are accessed using HTML browsers. However, instead of following document links between HTML pages, Semantic Web browsers enable surfers to navigate between different data sources by following RDF links. RDF links can also be followed by robots or Semantic Web search engines in order to crawl the Semantic Web. See Linked Data - The Story so far and How to publish Linked Data on the Web for more information about Linked Data.

This query page is designed to help you test OpenLink Virtuoso SPARQL protocol endpoint. Consult the Virtuoso Wiki page describing the service or the Online Virtuoso Documentation section RDF Database and SPARQL. There is also a rich Web based user interface with sample queries. You can access it at: /isparql.

YAGO is a huge semantic knowledge base. Currently, YAGO knows more than 2 million entities (like persons, organizations, cities, etc.). It knows 20 million facts about these entities. Unlike many other automatically assembled knowledge bases, YAGO has a manually confirmed accuracy of 95%. YAGO is part of the YAGO-NAGA project at the Max-Planck Institute for Informatics in Saarbrücken/Germany.

The Freebase Commons contains the types used to administer the Freebase application. Much of the content and the display preferences for types in the application is managed here. More

"Wikibase is the software that enables MediaWiki to store structured data or access data that is stored in a structured data repository. Wikibase basically consists of two MediaWiki extensions, Wikibase Repository and Wikibase Client, that can be enabled individually or together for a certain MediaWiki installation to turn it into a structured data repository, a client of a structured data repository or both."