UnoCSS

Sass is an extension of CSS3, adding nested rules, variables, mixins, selector inheritance, and more. It's translated to well-formatted, standard CSS using the command line tool or a web-framework plugin.

It is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.

It is a CSS post processor. It combs through compiled CSS files to add or remove vendor prefixes like -webkit and -moz after checking the code.

The css-loader interprets @import and url() like import/require() and will resolve them.

Less is a CSS pre-processor, meaning that it extends the CSS language, adding features that allow variables, mixins, functions and many other techniques that allow you to make CSS that is more maintainable, themable and extendable.

PostCSS is a tool for transforming CSS with JS plugins. These plugins can support variables and mixins, transpile future CSS syntax, inline images, and more.

Stylus is a revolutionary new language, providing an efficient, dynamic, and expressive way to generate CSS. Supporting both an indented syntax and regular CSS style.

It makes browsers render all elements more consistently and in line with modern standards. It precisely targets only the styles that need normalizing.

The compass core framework is a design-agnostic framework that provides common code that would otherwise be duplicated across other frameworks and extensions.

Bourbon is a library of pure sass mixins that are designed to be simple and easy to use. No configuration required. The mixins aim to be as vanilla as possible, meaning they should be as close to the original CSS syntax as possible.

It is a CSS file in which all class names and animation names are scoped locally by default. The key words here are scoped locally. With this, your CSS class names become similar to local variables in JavaScript. It goes into the compiler, and CSS comes out the other side.

It is a library that provides binding for Node.js to LibSass, the C version of the popular stylesheet preprocessor, Sass. It allows you to natively compile .scss files to css at incredible speed and automatically via a connect middleware.

It is less than 1KB css-in-js solution. It is built on the shoulders of well-established solutions. That means the API has been paved and we just need to follow it.

It is a fully-typed CSS-in-JS library featuring near-zero runtime, server-side rendering, multi-variant support, and a best-in-class developer experience.

Remove unused CSS. Also works with single-page apps.

It lets you write CSS in your JavaScript files without adding any runtime layer, and with your existing CSS processing pipeline.

It is a just-in-time compiler for Tailwind CSS that generates your styles on-demand as you author your templates instead of generating everything in advance at initial build time.

It makes it radically easy to get the looks of your favorite websites. Hover over any element, and get its CSS, font, dimensions, animations and selector, instantly.

It is a build time atomic CSS-in-JS library. Write your styles in JavaScript or TypeScript and it will create all CSS rules ahead of time baking everything the component needs to run.

First off, everything happens in your CSS file. You can layer this into your websites as you see fit. You can use this to layer on just a little bit more functionality in your CSS here and there or construct an entire page.

It combines Sass-like syntactical sugar — like variables, conditionals, and iterators — with emerging CSS features — like logical and custom properties, media query ranges, and image sets.

It is an implementation of the CSS (Cascading Style Sheet) parsing algorithm implemented as a pure C library with no outside dependencies. It's designed to serve as a building block for other tools and libraries such as linters, validators, templating languages, and refactoring and analysis tools.

It is a new CSS parser, compiler, and minifier written in Rust. It has significantly better performance than existing tools, while also improving minification quality. It handles compiling CSS modules, tree shaking, automatically adding and removing vendor prefixes for your browser targets, and transpiling modern CSS features like nesting, logical properties, level 4 color syntax, and much more.

It is a CSS-in-JS engine with near-zero runtime and ahead-of-time compilation. SSR support and styles are defined with JavaScript objects. You can simply install and use it in code directly.