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YAGO
YAGO3 is a huge semantic knowledge base, derived from Wikipedia WordNet and GeoNames. Currently, YAGO3 has knowledge of more than 10 million entities (like persons,... -
OpenCyc
About Now it is even easier to use the rich and diverse collection of real-world concepts in OpenCyc to bring meaning to your semantic web applications! The full OpenCyc... -
Science Commons
Data exposed: A bridging ontology, from Science Commons, importing other ontologies used in the prototype, defining classes and relations used to represent gene records and...