I would love to see this software on Github and to watch the organism "evolve" in different forks into different virtual organisms. A very meta-biological-software thing.
Well, the comment above yours says that the whole thing is available: http://news.ycombinator.com/item?id=4272721 There's nothing to stop you from creating a Github project with all that information yourself.
In my experience, physics researchers are not familiar with GitHub or similar OSS hosting sites. The omission of a Github project is likely through ignorance or apathy, rather than disapproval. I'd be happy (delighted!) for you to take my own physics simulations and play with them, for example.
