"Modern-looking" these days means shitty JS that tries to be a "WebApp" and breaks basic website conventions like open in a new tab middle click, and uses the same GUI both for small touchscreen and large desktop, so ends up working poorly on both. Why would anyone want that ?

This one? The JS is very light and optional. And this site is far more interactive than most websites.

I'm not sure why you need a modern "looking" site since JS is about the functionality not the looks.

Basecamp uses rails and turbolinks.