Ontotext GraphDB
Ontotext GraphDB (previously known as BigOWLIM) is a graph database and knowledge discovery tool compliant with RDF and SPARQL and available as a high-availability cluster. Ontotext GraphDB is used in various European research projects. As of April 2021, Graph DB is ranked as the 4th most -popular RDF store and 6th most-popular Graph DBMS system. Some categorize it as a NoSQL database. In 2014 Ontotext acquired the trademark "GraphDB" from Sones. As for a typical graph DB, ontologies are an important input for the databases. The underlying idea is a semantic repository. Architecture. GraphDB is built  on top of RDF4J architecture implemented through RDF4J's Storage and Inference Layer (SAIL). The architecture is made of three main components: Features and Integrations. According to the Ontotext, Graph DB supports: Uses. Ontotext Graph DB is used in various scientific areas, e.g., Genetics, Healthcare, Data Forensics, Cultural Heritage, Geography, Infrastructure Planning, Civil Engineering, Digital Historiography, Oceanography. Commercial clients include BBC Sport, "Financial Times", Springer Nature, UK Parliament, AstraZeneca as well as in the pharmaceutical and finance industries. Some use cases focus on scalability and large data sizes.