| Company | OpenLink Software |
| Website | virtuoso.openlink... |
| Blog | openlinksw.com/we... |
| Stage | Live |
| Launched | 1999 |
Available in both Open and Closed Source variations, Virtuoso is a middleware and database engine hybrid that combines the functionality of a traditional RDBMS, with ORDBMS, virtual database, RDF, XML, free-text, Web Application Server, and File Server functionality, in a single-server product.