robust regression packages for R?

Hello,
I was wondering if there are any robust regression packages
available for R? I would prefer robust MM regression package
something like what is described in the S-Plus manual (S-Plus
function is lrRobMM and it calls fortran ROBETH package).
But if that is not available perhaps there is something similar?
Best regards and congrats on great work.
Tomislav Goles
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