With relfinder, you can visualize the relationships between two entities, by setting the number of intermediate connections.
Enter two URIs, enter the number of connections, and the graph is being built, just like that!
But, unfortunately, this tool will only work with the triplestores that were already integrated. You can nevertheless “play” with it and see what links, say, Jean-Paul Sartre has with Che Guevara, and thus measure the suggestive power of the linked data schemas.