"OpenLink Virtuoso supports SPARQL embedded into SQL for querying RDF data stored in Virtuoso's database. SPARQL benefits from low-level support in the engine itself, such as SPARQL-aware type-casting rules and a dedicated IRI data type." Support ever conceivable database access system, including ODBC, JDBC, ADO .Net, REST, SOAP and WebDAV. wonder how it scales?
"Python WebDAV is a server implementation in python. It's aim is to provide a simple interface to webdav services to any application which needs it. It can be run as a daemon on *nix systems."