OpenLink Virtuoso is a multi-model database and application server from OpenLink Software. The vendor describes it as a DBMS combined with an HTTP application server, offering data virtualisation and knowledge-graph capabilities without first copying data. Organisations use it for data integration and knowledge-graph projects. It is installed as server software on Linux, Unix, Windows, macOS or Docker, or deployed on AWS and Azure under a bring-your-own licence. An open-source edition is published under the GNU General Public License.
OpenLink Software lists a US office in Needham Heights, Massachusetts, and a UK subsidiary in Croydon, and names no parent company or owner. Because Virtuoso runs on the customer's own servers or cloud account, the key question for a European organisation is where that deployment is hosted. The vendor's public pages do not state where AWS or Azure deployments are hosted, and no GDPR statement is published. Self-hosting on European infrastructure with the open-source edition keeps data under the organisation's control; commercial licences and support run through a US company.