The W3C published 2 days ago the OWL2 Recommendation, made by 12 documents. A great step further in SW technologies, 5 years after the first OWL Recommendation !
http://pellet.owldl.com/ontology-browser/
This link is now broken.
about:
OwlSight is an OWL ontology browser that runs in any modern web browser; it's developed with Google Web Toolkit and uses Gwt-Ext, as well as OWL-API. OwlSight is the client component and uses Pellet as its OWL reasoner.