Pingendo 4 is the most advanced Bootstrap 4 builder that make super fast building UX/UI prototypes and static websites. Available as desktop app and web app.
Pingendo features a super simple drag and drop interface, with a rich library of prebuilt elements that lets you create web pages with ease.
It produces just plain HTML, SASS and CSS to keep things simple, fully customizable and easily integrable with Javascript.
Integrates a text editor for live coding and a set of premaid templates.