Web Directory

» AKT Reference Ontologies
   Various ontologies developed in the framework of the Advanced Knowledge Technologies project. Includes a portal ontology.
   http://www.aktors.org/publications/ontology/

» Business Process Management Ontology
   BPMO is an integrated information model including business process design, project management, requirements management, and business performance management.
   http://www.bpiresearch.com/Resources/RE_OSSOnt/re_ossont.htm

» DAML Ontology Library
   An index of more than 200 publicly available ontologies expressed in DAML.
   http://www.daml.org/ontologies/

» Descriptive Ontology for Linguistic and Cognitive Engineering
   DOLCE is the first module of the WonderWeb Foundational Ontologies Library (WFOL).
   http://www.loa-cnr.it/DOLCE.html

» National Cancer Institute Thesaurus
   An OWL translation of the NCI Thesaurus, available for download (32 Mb) or online viewing.
   http://www.mindswap.org/2003/CancerOntology/

» OWL Ontology Library
   A selection of OWL ontologies usable in Protégé.
   http://protege.stanford.edu/plugins/owl/owl-library/index.html

» Open Biological Ontologies
   Provides access to controlled vocabularies for shared use across different domains, like MESH and Gene Ontology.
   http://obo.sourceforge.net

» OpenCyc
   OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine.
   http://www.cyc.com/cyc/opencyc/overview

» SWETO DBLP Computer Science Bibliography
   Semantic Web Technology Evaluation Ontology referencing printed journals and proceedings. Data from DBLP, DataBase Systems and Logic Programming, maintained by Michael Ley.
   http://lsdis.cs.uga.edu/projects/semdis/swetodblp/

» Semantic Web for Earth and Environmental Terminology
   Several ontologies published by the Jet Propulsion Laboratory in OWL format. Includes Space, Units, Earth Realms, Phenomena, Physical Properties, Substances and Units.
   http://sweet.jpl.nasa.gov/ontology

» Suggested Upper Merged Ontology
   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.
   http://www.ontologyportal.org

» The Enterprise Ontology
   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.
   http://www.aiai.ed.ac.uk/project/enterprise/enterprise/ontology.html