http://probstat.sourceforge.net Is my combination/permutation/cartesian back-of-the-envelope algos written in C with python bindings. I'm currently in the process of upgrading the algos and adding more python functionality (slices).

I've been meaning to add PerlXS bindings, but haven't had the time to learn anything complicated in XS. If someone can write an XS interface for one of the objects, I can fake it for the rest.

The license is GPL, oddly enough I'm working on it at this moment (pulling from http://sources.redhat.com/gsl/ the Gnu Scientific library for better C algos where I can). If you want to see what this perl code I wrote Name Me! MixMatch? looks like translated from C to perl, check it out.