RDQLPlus is a tool for querying RDF graphs, featuring
graphical results in a zoomable user interface (ZUI). It can
work with existing RDF files, Jena2 RDF databases, and a
native Java database called Mckoi.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.