The best place to start is with the Calais Document Viewer. The document viewer allows you to paste sample text and receive that text back with all entities, facts and events highlighted and navigable. You can also view the native RDF output and capture it for analysis in other tools.

RDF may be a beautiful thing for the representation of semantic content - but it is most definitely not a lot of fun to read. We've built a small (windows) application that will allow you to browse a folder of processed documents and see the types of semantic metadata extracted. You can download the installer below. The document viewer requires a current installation of the .NET framework.