UMBEL

UMBEL, short for Upper Mapping and Binding Exchange Layer, is a version of OpenCyc, providing the Cyc data in an RDF ontology based on SKOS, OWL and RDFS. Its purpose is to relate "Web content and data to a standard set of subject concepts [and] provide a fixed set of reference points in a global knowledge space. These subject concepts have defined relationships between them, and can act as binding or attachment points for any Web content or data."