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CO-ODE (Popularity:  )
http://www.co-ode.org/
Collaborative Open Ontology Development Environment is a project led by the Medical Informatics Group at the University of Manchester.
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European Centre for Ontological Research (ECOR) (Popularity: )
http://www.ecor.uni-saarland.de/
ECOR represents a new approach in applying ontology to a variety of problems in information science and related areas, by ...
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Protégé-2000 (Popularity: )
http://protege.stanford.edu/
A free open-source Java tool providing an extensible architecture for the creation of customized knowledge-based applications. Includes documentation, events and ...
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Open Cyc (Popularity: )
http://www.opencyc.org
OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and ...
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Ontology Works, Inc. (Popularity: )
http://www.ontologyworks.com
Makers of ontology engineering tools for enterprise information integration.
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F-OWL (Popularity: )
http://fowl.sourceforge.net/
An ontology inference engine for OWL, using Flora-2, an object-oriented knowledge base language and application development platform.
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Open Biological Ontologies (Popularity: )
http://obo.sourceforge.net
Provides access to controlled vocabularies for shared use across different domains, like MESH and Gene Ontology.
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Suggested Upper Merged Ontology (Popularity: )
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 ...
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