Relation type top-level ontologies
Ontology: A Resource Page
IKARUS: a WWW accessible knowledge management system (some ontologies are provided)
A WWW accessible prototype for WordNet 1.6, the multi-language WordNet (Netscape 2.0 required)
Some top-level ontologies
Here we list some kind-of hierarchies of first order types.
We do not address ontologies which are theories such as
the ontologies of KSL (Stanford).
Concept type top-level ontologies