Neo4j 1.2 Final - Prêt-à-Porter
blog.neo4j.org
blog.neo4j.org
Neo4j is released on AGPL. Their subscriptions allow you to pay to legally (IANAL so anyone want to step in here?) circumvent the AGPL and buy support
Price list: http://neotechnology.com/price-list
/peter
"Neo4j is released under a dual free software/commercial license model (which basically means that it’s open source under the AGPLv3 but if you’re interested in using it with closed source software, then you must buy a commercial license)." (http://neo4j.org)
Also, we have an AGPLv3 logo on our web page, there's a LICENSE.txt in our release tarballs, we mention it at the end of every presentation we give, and Neo4j is tagged with AGPL on sites like Freshmeat (http://freshmeat.net/projects/neo4j).
Please let me know how we can make it easier to find!
-EE
I like to take Ext.js as an example they where a front-runner in the JS toolkit space early on and to many looked like they had it in the bag. So much so that one day they switched their licensing to a GPL / commercial model. Overnight it seemed they went from the heir apparent to a footnote in the JS toolkit space.
Licensing has a lot to do with technical selection when it comes to application building blocks, I see Neo4J as a different but in the end similar building block and therefore the licensing is extremely important to me. I think they have a good piece of technology, that due to licensing will most likely leave it in the niche market, therefore I chose to not invest my time in it and learn one of the more liberally licensed alternatives, which since that time have gained momentum. On a purely technical level, I would have chose Neo4J so the moral of the story is that licensing plays an equal part in technical selection.
To be clear, I am not telling anyone how to license their hard work, just offering some insight into how some developers chose the technology to invest their time in.
Neo4j really is a great tool for maintaining and searching graph data. I use it from Jruby and Clojure in embedded mode.
There are other open source graph databases with more liberal licenses if that is what you need.