Bootstrap

A CSS framework to build responsive mobile-first sites with Sass variables and mixins, responsive grid system, extensive prebuilt components

Project Website
https://getbootstrap.com/
Offers premium version?
YES
First and last release
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About

Bootstrap is a free and open-source CSS framework directed at responsive, mobile-first front-end web development. It contains CSS- and JavaScript-based design templates for typography, forms, buttons, navigation, and other interface components.

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