Neo4j

Neo4j is an open-source, high-performance, enterprise-grade NOSQL graph database.   Neo4j is a robust (fully ACID) transactional property graph database. Due to its graph data model, Neo4j is highly agile and blazing fast. For connected data operations, Neo4j runs a thousand times faster than relational databases. More than 20 of the Global 2000, hundreds of startups and thousands of community members use Neo4j in a wide variety of use cases such as social applications, recommendation engines, fraud detection, resource authorization, network & data center management and much more.