Dydra
6.1#13 in rdf databasesFree planFree planWebAPISelf-hosted
VisitDydra may suit developers building applications around connected data who are familiar with RDF and SPARQL. Its public evaluation account has query-rate and repository-size limits.
It suits Java developers building applications with RDF, Linked Data, SPARQL endpoints, or Semantic Web data. Consider its stated dataset focus and Java runtime requirement when choosing a store.