Yep but the link that I have given was also free! ;)
<< Learn the Best 3D Plant Technology on Earth for FREE!
<< The Personal Learning Edition of Plant Factory is a fully functional version of Plant Factory Producer that lets you save your work and never expires.

Yes The L_System is a cool avatar of fractal (Benoit Mandelbrot) who is a cool avatar of Julia (Gaston Julia & Pierre Fatou) who is a cool avatar of...etc
Geometry is Fractal isn't ?