The repository is not accessible by us mortals, what I mean is there is no SVN or Git server you can hookup to. What Specifically what release are you looking for?
I was looking for the code of the latest commercially aligned release. If the source code is not available, then how can it be called open source? I did see source code for some of the development releases, but I don't see how that can really be useful to anyone other than for the sake of curiosity / learning, since dev releases are by definition unstable, so nobody should really be using them in production code. I guess I'm confused about what definition of "open source" they are using.