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Grapholytic - grapholytic by MIOsoft produces results from the combination of a Graph DB and a scalable object database architecture.
neo4j - Meet Neo4j: The graph database platform powering today's mission-critical enterprise applications, including artificial intelligence, fraud detection and recommendations.
Apache TinkerPop - Apache TinkerPop is a graph computing framework for both graph databases (OLTP) and graph analytic systems (OLAP).
JanusGraph - JanusGraph is a scalable graph database optimized for storing and querying graphs.
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.
Blazegraph - Blazegraph is a scalable, high-performance graph database with support for the Blueprints and RDF/SPARQL APIs.