I use Neo4j for two projects at the moment, though I make pretty heavy use of the REST api as I'm not working on the JVM. What advantages does Stardog have over Neo4j?

It supports both property graphs and semantic graphs seamlessly, plus a bunch of other powerful features Neo4j can't touch like virtual graphs (http://docs.stardog.com/#_virtual_graphs), integrity constraints (http://docs.stardog.com/#_validating_constraints), explanations (http://docs.stardog.com/#_explaining_reasoning_results), versioning graphs with a Git-like model (http://docs.stardog.com/#_versioning), user-defined rules (http://docs.stardog.com/#_user_defined_rule_reasoning). And it supports all of TinkerPop3 including Gremlin.

It also has full REST support for non-JVM apps.

Stardog is a better graph database, but especially when integrating heterogenous data in the graph is key to success.

Interesting. I'll have to play with it this weekend. Thanks for the information.

Combines property graph (Apache TinkerPop 3 and Gremlin) with RDF, SPARQL, OWL, and rules... Graph all teh things!