Explorator is a tool for exploring RDF data by direct manipulation. Explorator’s web interface allows users to explore a semi-structured RDF database to both gain knowledge and answer specific questions about a domain, through browsing, search, and exploration mechanisms.
More information on how to download Explorator and how to use it can be found in the Explorator Wiki: http://www.tecweb.inf.puc-rio.br/explorator. A demo of Explorator is available at http://www.tecweb.inf.puc-rio.br/explorator/demo (only for Firefox, Safari, Chrome and Opera browsers).
This video gives a short presentation illustrating Explorator's functionality and underlying philosophy.