Humfrey-java is a project mainly written in JAVA and PYTHON, it's free.
RDF store with a RESTful update interface, using Java, Jena and NG4J. Developed for http://data.ox.ac.uk/.
Humfrey is a Jena-based RESTful RDF web service developed for the University of Oxford <http://www.ox.ac.uk>'s data.ox.ac.uk <http://data.ox.ac.uk/> service.