DAML Ontology Library
An index of more than 200 publicly available ontologies expressed in DAML.
Descriptive Ontology for Linguistic and Cognitive Engineering
DOLCE is the first module of the WonderWeb Foundational Ontologies Library (WFOL).
Open Biological Ontologies
Provides access to controlled vocabularies for shared use across different domains, like MESH and Gene Ontology.
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.
The Enterprise Ontology
Collection of terms and definitions relevant to business enterprises. Developed in the Enterprise Project by the Artificial Intelligence Applications Institute at the University of…
ThoughtTreasure
A web-accessible ontology system with terms in English and French. A downloadable version is also available.