The interesting part - for some people at least - is in the licensing. Neo4j has long chose a very viral open source license for its projects and products: the GPLv3, and the Affero GPL. The former is the license for the Neo4j Community Edition, and the latter is one of the two licenses (Neo Technology also offers a Commercial License, with none of the restrictions/obligations that the AGPL imposes) of the Enterprise Edition.
While I was researching the differences recently, I came across Choose A License, a github site that helps people choose the right open source license model. And so I decided to make a graph out of that. I created a graphgist, which you can view over here. Hope you like it - and that the information is actually useful.