> This site describes essentially httrack, but they put
> their own name on it.  They say they don't charge for the
> product, but they do charge for shipping and distribution.

Yes - and at least they did not change the license (GPL) 
and clearly stated that the software was "free" (even if I 
doubt they understood "free" mainly reffered to "freedom")

After all, if they provide support and services, why not.

> Is this legal under GNU GPL?
There is no clear GPL violation - they give full sources, 
and announce that the software is GPL, before even selling 
it. It looks okay AFAIS. And there are no deceptive claims 
concerning the license and copyright ownership.

The only sad thing is the name change, which is a bit 
ridiculous : I doubt that they'll merge bugfixes easily.
(I don't know if this is legal to remove the original name 
and credits, BTW).