Web Ontology Language

OntologyDesignPatterns.org is a Semantic Web portal dedicated to ontology design patterns (ODPs).

The portal was started under the NeOn project, which still partly supports its development.

A standalone tool with a simple GUI interface. Run SPARQL on your local or remote RDF files, or through SPARQL endpoints.

GrOWL: intuitive knowledge browsing and editing
The development, understanding, and maintenance of shared, formal models of disciplinary knowledge (ontologies) is one of the most important challenges of ecoinformatics. Ontologies are the glue that holds heterogeneous data and applications together. It is of paramount importance that natural system scientists have access to ontologies in ways that do not require them to become computer scientists or learn awkward concepts. Unfortunately, the development and understanding of ontologies are far from easy with the current generation of tools. GrOWL is the Ecoinformatics Collaboratory's answer to the need of intuitive knowledge visualization and editing tools.

to be able to model the relationships between prominent web ontologies and map them onto equivalent Freebase types and topics

Document Overview W3C Recommendation 27 October 2009