When the first sentence on the page is "This website requires Javascript to be enabled.", I leave; but not before looking at the source and discovering a relative monstrosity, unlike the original PuTTY site which is almost pure content.
I'm sure it's a great piece of software, but sometimes, the simpler is better. I used PuTTY for a decade or so, and while it was kinda ugly and clunky, it's very beautiful and perfect because of its imperfections.