OpenLink Software is a leading technology innovator of standards-compliant middleware used by more than 10,000 companies worldwide.  Its cross-platform products include universal data access drivers; the Virtuoso universal database engine, Web services platform, and Web application server; and OpenLink Data Spaces (ODS), a distributed collaborative application platform for creating semantic Web presence.  OpenLink was founded in 1993 and is privately held with offices in the U.S., United Kingdom and Netherlands.

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Cycorp is a leading provider of semantic technologies that bring a new level of intelligence and common sense reasoning to a wide variety of software applications. Its Cyc® software — developed over 20 years — combines an unparalleled common sense ontology and knowledge base with a powerful reasoning engine and natural language interfaces to enable the development of novel knowledge-intensive applications.

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The Cyc Foundation is a not-for-profit organization dedicated to the enrichment and utilization of the open source portions of the Cyc knowledge base — the world's largest repository of machine-readable, common-sense knowledge. The foundation works to expand these resources through software development and community initiatives that educate developers and increase awareness of the potential applications of the technology.

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Yago ("Yet Another Great Ontology") is a huge semantic knowledge base extracted from Wikipedia and organized according to WordNet.  Yago contains over 1.7 million entities (such as persons, organizations, cities, etc.), and 14 million facts about these entities according to nearly 100 relations in a simple and elegant design.  Yago is being developed at the Max-Plack-Institute Saarbrücken.

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Linking Open Data is a community project of the W3C's Semantic Web Education and Outreach (SWEO) group. Since 2007, the project has catalyzed publishing interlinked datasets of over two billion RDF triples, interlinked by around 3 million RDF links, from high-value reference sources, including notable place, people, event, book, music, cultural, language and government entities.

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DBpedia is a community effort to extract structured information from Wikipedia and to provide query, linkage and best-practices guidance for other Linked Data.  The DBpedia dataset currently provides information about more than two million “things” from about 30 authoritative sources on people, places, music, films, books, countries, languages, topics, science and other entities containing more than 200 million RDF triples.

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