OWL's in the field
- Ontology Library contains 257 ontologies in DAML+OIL and OWL (convertible one to the other).
- NCIBI Cancer Ontology: 17,000 classes (about 1M definitions), 500k+ triples.
- OpenCYC: 7,000 classes, broad range of topics; "upper" ontology
- UN Standard Product Codes: 10,000 commerce classifications>
- Heads of State, Weather conditions, Airports, Wordnet, Int'l Custom Codes...
- Ontology Library Search Site
- Tools for every facet of the ontology life cycle.
