OpenLink Virtuoso Universal Server edit  

Multi-model database (RDBMS, VDBMS) supporting tabular relational (SQL), graph relational (SPARQL), hybrid (SPARQL-in-SQL a/k/a SPASQL), XML (XPath, XQuery, XSLT), filesystem/objects, and other forms of data; First shipped in 1999, available as Open Source or Enterprise Edition; various add-ons available for Enterprise Edition; virtualizes local and/or remote tabular relational databases and/or other data sources as RDF semantic web data sources.

Technology Information

TypeCommercial Open Source
Last UpdatedMarch 2018