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Grasp is still the fastest for quick overall ES calculation even on 8
year old SGI's. There is a windows version
called Grasp2 which I believe I was able to run under Wine on linux. You
should be able to run it under Mac using whatever
virtualization software.
The only program which I don't have on my Mac is Grasp - but there are
other options to represent an electrostatic potential.
Juergen