From W3C Wiki

OpenLink Virtuoso is a multi-purpose and multi-protocol (Hybrid) Data Server from OpenLink Software that includes SQL Object-Relational, RDF, XML, and Free Text data management, alongside Web Application (HTTP, SOAP, WebDAV), SyncML, and Discussion Server functionality, in a single server.

Additional Information Links



Live Demo & Tutorial Links

RDBMS to RDF Linked Data

Major RDBMS Engines & Their Samples Databases
Industry Standard Benchmarks
Web 2.0 Applications