Virtuoso
Virtuoso is a high-performance, multi-model database management system that supports relational, graph, document, and RDF data models. It is designed for enterprise-scale applications, offering features like SQL and SPARQL querying, ACID compliance, and built-in web services. Originally developed by OpenLink Software, it is widely used in semantic web, linked data, and complex data integration scenarios.
Developers should learn Virtuoso when working on projects involving semantic web technologies, linked data, or applications requiring integration of diverse data types (e.g., relational and graph data). It is particularly valuable for building knowledge graphs, enterprise data hubs, and systems that need to query RDF data efficiently using SPARQL, such as in research, publishing, or government data initiatives.