Software for calculating general fractional factorial design?

Hi guys,

I'm wondering if any of you know a computer software that can perform general (multi-level) fractional factorial design (http://en.wikipedia.org/wiki/Fractional_factorial_design)?

I've looked at Axiom **·** Eigenmath **·** Mathomatic **·** Maxima **·** PARI/GP **·** Reduce **·** Sage **·** Yacas, Macsyma **·** Maple **·** Mathcad **·**Mathematica, none of them seem to to do it. MatLab only does

2-level designs.

So, is there any software that can do a genearl FFD?

Thanks a lot.

-D