DES w/ variable S-boxes

Are there any implementations of DES-variants that use variable S-boxes?
I've not seen any, and it seems to me that such an algorithm could be quite
strong, considering the continuing strength of DES (i.e., only the rich or
large gov'ts are likely to be able to break it today, and only by brute
force).

If not, is there likely to be enough demand that I should start coding?

b&

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Date: Wed, 15 Jun 1994 17:32:24 -0700
    From: Ben.Goren@asu.edu

    Are there any implementations of DES-variants that use variable S-boxes?

Well, if you don't use the DES S-boxes then it isn't DES :-)

Variable boxes tend to weaken DES.  The DES S-boxes were chosen to
make differential cryptanalysis difficult.  Random S-boxes don't tend
to have this desirable property.  Use IDEA.

			Rick