| 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/ |
| On-To-Knowledge A project of the European Information Society Technologies, under 5th Framework Program (1999-2002). http://www.ontoknowledge.org/ |
| Ontology Works, Inc. Makers of ontology engineering tools for enterprise information integration. http://www.ontologyworks.com/ |
| Open Cyc The world's largest and most complete general knowledge base and commonsense reasoning engine. http://www.opencyc.org/ |
| 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/ |
| 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/ |