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CO-ODE
Collaborative Open Ontology Development Environment is a project led by the Medical Informatics Group at the University of Manchester.
http://www.co-ode.org/
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On-To-Knowledge
A project of the European Information Society Technologies, under 5th Framework Program (1999-2002).
http://www.ontoknowledge.org/
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Ontology Works, Inc.
Makers of ontology engineering tools for enterprise information integration.
http://www.ontologyworks.com/
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Open Cyc
The world's largest and most complete general knowledge base and commonsense reasoning engine.
http://www.opencyc.org/
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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/
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WordMap Taxonomy Management Software
Allows an organisation to ensure semantic interoperability of metadata, through consistent terminology in all of its applications, assets and activities.
http://www.wordmap.com/
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