Amazon Neptune — now generally available — is a fast, reliable graph database service that makes it easy to build and run applications that work with highly connected datasets. Neptune supports popular graph models Property Graph and W3C’s Resource Description Framework (RDF), and their respective query languages Apache TinkerPop Gremlin 3.3.2 and SPARQL 1.1.

Source: Amazon Web Services News Amazon Neptune is now generally available to build fast, reliable graph applications