The other responsive libraries (2022 edition)
Quite often in my day to day web projects i use the following MaterialUI mainly because it actually employs a nice design system and logic to it; Plays nice with React; There's an edition for every framework; and has a lot of well maintained supporting libraries and examples.
MUI: The React component library you always wanted
MUI provides a simple, customizable, and accessible library of React components. Follow your own design system, or start with Material Design. You will develop React applications faster.
Another fairly complete competitor is
Ant Design - The world’s second most popular React UI framework
An enterprise-class UI design language and React UI library with a set of high-quality React components, one of best React UI library for enterprises
and the quite popular
Tailwind CSS - Rapidly build modern websites without ever leaving your HTML.
Documentation for the Tailwind CSS framework.
the one i have yet to use but is still on my radar
Bulma: Free, open source, and modern CSS framework based on Flexbox
Bulma is a free, open source CSS framework based on Flexbox and built with Sass. It’s 100% responsive, fully modular, and available for free.
Alejandro Barrera A. ale_codes
On the minimalist front we have:
Feather | A beautiful user interface framework
A simple, beautiful, and lightweight CSS framework.
Spectre.css CSS Framework
Spectre.css CSS Framework is a lightweight, responsive and modern CSS framework for faster and extensible development. Spectre provides basic styles for typography and elements, flexbox based responsive layout system, pure CSS components and utilities with best practice coding and consistent design…
Yan Zhu
Pure
Pure is a ridiculously tiny CSS library you can use to start any web project.
new.css
A classless CSS framework to write modern websites using only HTML.
https://seek-oss.github.io/braid-design-system/foundations/layout/
and then to the extreme we have
lit