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olliesaunders
Is anybody using this DBMS for anything?
mark_l_watson
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.

bsb
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).
mark_l_watson
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.
bsb
already on the beta list ;)
espeed
Yes, we're using it for Whybase, and open sourced Bulbs, a Python persistence framework for it (http://bulbflow.com).
matan_a
I've been using neo4j for a while now for a new project and i'm very impressed so far - especially if you have typical graph problems to solve (social networks?). I especially like the fact that it's ACID compliant and has an embedded lucene search to solve non-traversal type queries. Good for them that they raised some cash to further develop their product.

Their beta module on Heroku is another win win for me :)

ayeeson
not only does this prove an upward moving trend in NOSQL databases, but that neo4j is ahead of the curve. I know some of the guys behind Neo4j, and they work harder than anyone to make sure the database is stable, reliable, and all around kick-ass.