rdf2pg is a framework to convert from RDF data to labelled property graphs (PG), aiming at supporting custom mapping from RDF data models to any target PG format or graph database.
At the moment, we have a tool to convert RDF to Neo4j data, and one to produce graphml files.
Please go to the wiki for everything.
The rdf2neo and rdf2graphml comes shipped as command line tools (in addition to usable Java libraries). Please refer to the Download Page for that.
A list of rdf2pg publications is here.