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ARQ : http://openjena.org/ARQ/ - Supports the W3C standard for RDF queries.  This This is packaged with Jena and can be used against Jena models.

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Stores represent the ability to store RDF and OWL representations.  These tool These tools provide support for larger data sets, and datasets which can be used in a way which will allow for some amount of use within service environments.  Although the tools listed below are open source, there are also non-open source tools which provide similar functionality including AlegroGraph and Oracle 11G.  These system may also use Jena or Sesame for access.

Jena TDB : http://openjena.org/TDB/ - This is an integration between the Jena model factory which provides a high speed persistence of RDF triples.   Writes to this system are not fully transactional, and so care must be taken to manage transactions externally, were where required.

Jena SDB : http://openjena.org/SDB/ - Provides a persistance model using a verity of RDBMS back ends.  Utilizing JDBC connections, SDF persists into traditional tables the RDF triple information.  This solution is fully transaction, but suffers from insert and query limitations for performance.

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