Yes, Geneweb may be free, but as has been said by others TNG looks the superior application.
I have already purchased TNG for use in my family website which currently uses PHPnuke.
I am, though, not entirely happy with PHPnuke and, having recently discovered the joys of XOOPS, was considering switching.
However the lack of a decent genealogy nodule is a big drawback for me. Is there any news on this front and is there any chance of TNG being modularized?