Simple.css is a classless CSS framework that makes semantic HTML look good, really quickly. By classless it means that there are no CSS classes anywhere in the CSS or the HTML. So your website can look just like this using plain old vanilla HTML.

A modest JavaScript framework for the HTML you already have. Stimulus is a JavaScript framework with modest ambitions. It doesn’t seek to take over your entire front-end—in fact, it’s not concerned with rendering HTML at all. Instead, it’s designed to augment your HTML with just enough behavior to make it shine

Storefrontui is a Vue.js UI library dedicated to eCommerce. It let you create stunning, mobile-first online stores with this 100% customizable design system.