Neo4j – Highly Scalable Native Graph Database
http://neo4j.com/

Neo4j is a highly scalable, native graph database purpose-built to leverage not only data but also its relationships. Neo4j’s native graph storage and processing engine deliver constant, real-time performance, helping enterprises build intelligent applications to meet today’s evolving data challenges. This will be added to Entrepreneurial Resources Subject Tracer™. This will be added to the tools section of Research Resources Subject Tracer™ Information Blog.