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Mac Geek. Human Middleware. Shamanic Witch. Shapeshifter. Singer. Drummer. Dancer. Dreamer.

Technical Evangelist for OpenLink Software, maintainer/supporter/vendor of (among other things):

  * Open Source
    * OpenLink Virtuoso (Open Source Edition) a/k/a 
      VOS, the cross-platform hybrid Relational/Graph/
      FreeText Store and SQL/SPARQL Engine (and much 
      more) hosting DBpedia, Bio2RDF, and many others
    * the OpenLink Data Explorer
    * the OpenLink AJAX Toolkit
    * the iODBC (Independent ODBC) project

  * Commercial
    * OpenLink Virtuoso (Commercial Edition), the 
      cross-platform hybrid Relational/Graph/FreeText 
      Store and SQL/SPARQL Engine (and much more) 
      hosting URIBurner, the LOD Cloud Cache, and 
      many others
    * the OpenLink Universal Data Access Suite of 
      cross-platform ODBC, JDBC, ADO.NET, OLE DB, 
      and XMLA drivers/providers
ObDisclaimer: I do not directly benefit from anyone's choice to use or purchase any of the above software.
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Cayley – An open-source graph database 12 years ago

It's worth noting that Virtuoso (produced by my employer, available in free Open Source and paid Commercial variants, http://virtuoso.openlinksw.com/features-comparison-matrix/) is a hybrid Relational/Graph/XML/FreeText storage and query engine, which natively supports SQL, SPARQL, XPath, XQuery, and many other open standards. It might satisfy the OP's needs on its own.

Virtuoso's support for open standards makes it easy to use it as a complete solution covering all the bases, or, as in @philjohn's case, to plug-and-play with best-in-breed solutions along any axis where our implementation proves not to serve your needs for any reason. (We do want to know how and why we don't measure up, so we can improve that aspect!)

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