Various ontologies developed in the framework of the Advanced Knowledge Technologies project. Includes a portal ontology.

BPMO is an integrated information model including business process design, project management, requirements management, and business performance management.

An index of more than 200 publicly available ontologies expressed in DAML.

DOLCE is the first module of the WonderWeb Foundational Ontologies Library (WFOL).

The main EuroWordnet concepts mapped to corresponding Cyc constants through dynamic pages.

An OWL translation of the NCI Thesaurus, available for download (32 Mb) or online viewing.

An OWL publication of the ISO 19115 standard, from Drexel University.

Provides access to controlled vocabularies for shared use across different domains, like MESH and Gene Ontology.

OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine.

A selection of OWL ontologies usable in Protégé.

Several ontologies published by the Jet Propulsion Laboratory in OWL format. Includes Space, Units, Earth Realms, Phenomena, Physical Properties, Substances and Units.

A free, formal ontology in first order logic with domain ontologies totalling 20,000 concepts and 60,000 axioms, with mappings to all of WordNet.

Collection of terms and definitions relevant to business enterprises. Developed in the Enterprise Project by the Artificial Intelligence Applications Institute at the University of Edinburgh.

A web-accessible ontology system with terms in English and French. A downloadable version is also available.