Quaestor is a generic triplestore and SPARQL endpoint, which allows you to upload ontology and instance data, and query the result through a RESTful interface. It's built on top of Jena.

For more details, see the overview and installation instructions

The code was written uner the auspices of the AstroGrid project. Most of the code is available under the Academic Free Licence v2.1, but the code added since the move to google code is available under a BSD-style licence