https://techcrunch.com/2018/05/30/awss-neptune-graph-database-is-now-generally-available/

AWS today announced that its Neptune graph database, which made its debut during the platform’s annual re:Invent conference last Novemberr, is now generally available. The launch of Neptune was one of the dozens of announcements the company made during its annual developer event, so you can be forgiven if you missed it.

Neptune supports graph APIs for both TinkerPop Gremlin and SPARQL, making it compatible with a wide variety of applications. AWS notes that it built the service to recover from failures within 30 seconds and promises 99.99 percent availability.