Library for fractionating arbitrary factorial designs?

[Joseph Davis <joe.davis@pdf.com>]

       Hello Snews,
 
 I am building a DOE with up to 10 factors with a mix of 2,3,4 levels for 
each of the factors. Of course, I'd like to fractionate this design intelligently 
to get the results I need in the minimum number of runs. 
 
 Ideally, I'd like to be able to describe the model (or set of candidate
models) I want to estimate from the DOE and have the SW pop out the minimum
fractionated design or set of designs. The fractionate function in
Splus only handled 2^k designs. Does anyone have or know of functions to
accomplish this task either in Splus , stand alone, or some other package?
 
 Thank you very much for your help!
 
 regards,
 jcd