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@Karl**
Sounds awesome and ambitious, and yes I'd beta-test, but I don't think you're gonna learn to program everything you need to compete with Bryce in just a few years.  Unless you're a natural at programming and have a genuine passion for hardware like the Pi, I think you might be disappointed.

That said, it would be amazing to have something like Bryce built from the ground up to run on a Raspberry Pi (and it's future replacements).

@MalenySteve
Looks interesting but I wouldn't use an Apple product with a gun to my head, those programs are all Mac so they're pretty much useless to the majority of us.  At the very least, they need to work on Windows too, and better still, GNU/Linux.