Blazegraph
Blazegraph is a triplestore and graph database , which is used in the Wikidata SPARQL endpoint . 
<triplet> Blazegraph <subj> triplestore <obj> instance of <subj> graph database <obj> instance of <subj> SPARQL <obj> uses <triplet> triplestore <subj> graph database <obj> subclass of <triplet> SPARQL <subj> Wikidata <obj> used by