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Re:Neo4j NoSQL Graph Database raise further $10m in funding by mark_l_watson on Wednesday September 21, 2011 @10:26AM (#3022098)
One of my customers is using it. I also use it for a side project.

It is a robust graph database that seems to be optimized for exploring graphs from any given starting node. This is different from RDF graphs with SPARQL queries that are highly indexed and optimized for queries. There are also more hybrid systems like AllegroGraph that are both optimized for queries and graph traversal from a starting node.

Re:Neo4j NoSQL Graph Database raise further $10m in funding by bsb on Wednesday September 21, 2011 @11:00AM (#3022242)
There's also Stardog (stardog.com), from the makers of the Pellet OWL reasoner, which just entered this space. AllegoGraph is pretty cool, one of the best examples of commercial LISP success, and they have a pretty rich ecosystem around AllegroGraph (Jena, Sesame, etc support).
Re:Neo4j NoSQL Graph Database raise further $10m in funding by mark_l_watson on Wednesday September 21, 2011 @12:24PM (#3022589)
I have tried out two beta versions of StarDog, which is also very nice. If you ask, I think that they will provide you with the beta system.
Re:Neo4j NoSQL Graph Database raise further $10m in funding by bsb on Wednesday September 21, 2011 @03:01PM (#3023248)
already on the beta list ;)