I (and others) have been working on him for years to release this stuff as open source, and he's finally done it!
Go check it out the Multiverse 3D trac site, and get the code!
Do it!
Do it now!
(and then start submitting patches to get its persistence layer ported back over to Axiom because I told Mike not to block the release on that but it should totally be using Axiom and he only switched away from it because he didn't understand quite how it worked...)