Cyc is an artificial intelligence project that attempts to assemble a comprehensive ontology and knowledge base of everyday common sense knowledge, with the goal of enabling AI applications to perform human-like reasoning. The project was started in 1984 by Douglas Lenat at MCC and is developed by company Cycorp. Parts of the project are released as OpenCyc, which provides an API, RDF endpoint, and data dump under an open source license.
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OpenCyc is back and better than ever!
OpenCyc 2.0 is now available for download from SourceForge.
You can also download OWL versions of the OpenCyc ontology,
or search for and access OpenCyc content on the semantic web, accessing Cyc concepts via their URIs, at sw.opencyc.org.