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	DAML Ontology Library - http://www.daml.org/ontologies/ An index of more than 200 publicly available ontologies expressed in DAML.
	Open Biological Ontologies - http://obo.sourceforge.net Provides access to controlled vocabularies for shared use across different domains, like MESH and Gene Ontology.
	National Cancer Institute Thesaurus - http://www.mindswap.org/2003/CancerOntology/ An OWL translation of the NCI Thesaurus, available for download (32 Mb) or online viewing.
	Suggested Upper Merged Ontology - http://www.ontologyportal.org 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.
	Descriptive Ontology for Linguistic and Cognitive Engineering - http://www.loa-cnr.it/DOLCE.html DOLCE is the first module of the WonderWeb Foundational Ontologies Library (WFOL).

	AKT Reference Ontologies - http://www.aktors.org/publications/ontology/ Various ontologies developed in the framework of the Advanced Knowledge Technologies project. Includes a portal ontology.
	OWL Ontology Library - http://protege.stanford.edu/plugins/owl/owl-library/index.html A selection of OWL ontologies usable in Protégé.
	Semantic Web for Earth and Environmental Terminology - http://sweet.jpl.nasa.gov/ontology Several ontologies published by the Jet Propulsion Laboratory in OWL format. Includes Space, Units, Earth Realms, Phenomena, Physical Properties, Substances and Units.
	SWETO DBLP Computer Science Bibliography - http://lsdis.cs.uga.edu/projects/semdis/swetodblp/ Semantic Web Technology Evaluation Ontology referencing printed journals and proceedings. Data from DBLP, DataBase Systems and Logic Programming, maintained by Michael Ley.
	The Enterprise Ontology - http://www.aiai.ed.ac.uk/project/enterprise/enterprise/ontology.html 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.

	Business Process Management Ontology - http://www.bpiresearch.com/Resources/RE_OSSOnt/re_ossont.htm BPMO is an integrated information model including business process design, project management, requirements management, and business performance management.
	http://www.cyc.com/cyc/opencyc/overview - http://www.cyc.com/cyc/opencyc/overview OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine.

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