| CO-ODE - http://www.co-ode.org/ Collaborative Open Ontology Development Environment is a project led by the Medical Informatics Group at the University of Manchester. |
| Hyphen.info - http://www.hyphen.info/ |
| KR, Inc. - http://www.kr.org/ Charitable organization concerned with fostering research and communication on knowledge representation and reasoning. Features conferences, educational materials and mailing lists. |
| Ontoweb - http://www.ontoweb.org/ The community site for Ontoweb, a European Union founded project about Ontology-based information exchange for knowledge management and electronic commerce. |
| SchemaWeb - http://www.schemaweb.info/ Repository for RDF schemas expressed in the RDFS, OWL, and DAML+OIL schema languages. |