- The CWRC Ontology
The CWRC Ontology is the ontology of the Canadian Writing Research Collaboratory.
- The DBpedia Ontology
The DBpedia ontology provides the classes and properties used in the DBpedia data set.
- FAO Geopolitical Ontology
FAO's geopolitical ontology version 1.1 was populated with FAO, UN and internationally recognized data sources.
- LinkedGeoData ontology
LinkedGeoData ontology has been derived from concepts defined by Open Street Map
- The Lingvoj Ontology
An ontology for using languages as resources
- Ontology of units of Measure (OM)
The Ontology of units of Measure (OM) 2.0 models concepts and relations important to scientific research. It has a strong focus on units, quantities, measurements, and dimensions.
- The Places Ontology
The Places Ontology is a simple lightweight ontology for describing places of geographic interest.
- Time Ontology
This vocabulary defines temporal entities such as time intervals, their properties and relationships.
- VIVO Core Ontology
An ontology of academic and research domain, developed in the framework of the VIVO project