Bootstrap is a open-source collection of tools for creating browser sites and applications. It contains HTML and CSS-based design templates for typography, forms, buttons, charts, navigation and other interface components, as well as optional JavaScript extensions.

Tailwind is different from frameworks like Bootstrap, Foundation, or Bulma in that it's not a UI kit.

Semantic empowers designers and developers by creating a shared vocabulary for UI.

Foundation is an easy to use, powerful, and flexible framework for building rapid prototypes and production code on any kind of device.

A lightweight and modular front-end framework for developing fast and powerful web interfaces.

Simple. Built on open source. The responsive front-end library based on Google's Material Design.

Over 400+ professionally designed, fully responsive, expertly crafted component examples you can drop into your Tailwind projects and customize to your heart’s content.

A set of small, responsive CSS modules that you can use in every web project.

CSS-in-JS with build time generated styles, RSC compatible, multi-variant support, and best-in-class developer experience.

Build fully functional accessible web applications faster than ever – Mantine includes more than 100 customizable components and 50 hooks to cover you in any situation.

Polymer is a library that uses the latest web technologies to let you create custom HTML elements. Build anything from a button to a complete application as an encapsulated, reusable element that works across desktop and mobile.

Material UI is an open-source React component library that implements Google's Material Design. It's comprehensive and can be used in production out of the box.