•
WebOnto
(http://eldora.open.ac.uk:3000/webonto):
–
Knowledge Media Institute, Open University, UK,
•
Ontolingual (http://www-ksl-svc.stanford.edu:5915/):
–
Knowledge Systems Laboratory, Stanford University, USA),
DAML Ontology library system (http://www.daml.org/ontologies/):
SHOE (http://www.cs.umd.edu/projects/plus/SHOE/):
–
University of Maryland, USA,
Ontology Server (http://www.starlab.vub.ac.be/research/dogma/OntologyServer.htm):
–
Vrije Universiteit, Brussels, Belgium,
•
IEEE Standard Upper Ontology (http://suo.ieee.org/refs.html):
OntoServer (http://ontoserver.aifb.uni-karlsruhe.de/):
–
AIFB, University of Karlshruhe, Germany
•
ONIONS (http://saussure.irmkant.rm.cnr.it/onto/):
–
Biomedical Technologies Institute (ITBM) of the
Italian National Research Council (CNR), Italy.