Semantic Graph, Gql, Graph Theory, Knowledge, Ontology.
Virtuoso, Stardog, Vaticle, HypergraphDB, Allelograph, RDF4J, GraphDB, MarkLogic, Giraph, DSE graph, Amazon Neptune, Oracle Spatial & Graph, Anzograph DB, Garlic 4store, BigDataR, YARS2, Jena, Ontotext, ArangoDB, OrientDB, FlockDB, DataStax, Cassandra, Cayley, Titan, Azure Cosmos DB, Apache Giraf.