This is a (incomplete) list of ontology repositories and sources we use. If you would like us to add a repository, please let us know.
- Swoogle: the Semantic Web Search Engine (last updated 2007)
- NCBO BioPortal: repository for bio-ontologies
- TONES ontology repository: ontologies used mainly for testing purposes
- OBO Foundry: biological and biomedical ontologies
- Dumontier Lab: repository for bio-ontologies
- Protege ontology library: ontologies from various domains
- LOV: Linked Open Vocabularies