RelFinder, a new Adobe Flex-based application, has been announced by a collection of researchers from the University of Stuttgart, the Carlos III University of Madrid and the University of Duisburg-Essen. Additional contributions have been made by individuals from the University of Leipzig and AKSW.
The application can be configured to point to arbitrary RDF datasets exposed through a SPARQL endpoint, but uses several standard data sets out of the box. The default sources include: