I was playing with MaxScript, trying to see how I can rewrite the .mel ca script and at the end I came up with a much more elaborate version for 3ds max, that implements 18 different sets of rules.
CA are quite critical for what I am researching right now (self-organization that is...). It is really impressive how different classes of rules produce different results, from quickly normalized ones to totally chaotic (rule 30).
The script is available for downloading at the tools section.

This is a project, already quite old, that we presented at the 2005 UIA conference in Istanbul. It looks like it took some time but finally they published a selection from the presentations, including ours, under the title "Folding the Suburbs". I hope that it still makes some sense after five years... It was written and presented in collaboration with Vana Tentokali, Katerina Tryfonidou & Magdalena Pantazi.

I finally found some time to wrap the ca mel scripts with a UI and to upload the at the /tools section of the blog. The following images are some examples where I used the ca in orders to generate geometry; surfaces in these cases.