Best CSS Pre-processors / Extensions

Syntatically Awesome Style Sheets

Open Source

Animate.css is a cross-browser library of CSS animations.

Less extends CSS with dynamic behavior such as variables, mixins, operations and functions. Less runs on both the server-side (with Node. js and Rhino) or client-side (modern browsers only).

The instant on-demand atomic CSS engine. Contribute to unocss/unocss development by creating an account on GitHub.

Application and Data, Languages & Frameworks, and CSS Pre-processors / Extensions

Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.

Open Source

EXPRESSIVE, DYNAMIC, ROBUST CSS

Open Source

Bourbon - A simple and lightweight mixin library for Sass / CSS.

Open Source

autoprefixer - Parse CSS and add vendor prefixes to rules by Can I Use

Compass is an open-source CSS Authoring Framework.

Open Source

The easiest way to get and edit the CSS of any website, live

Empowering agents with technology to better serve all of your real estate needs.

Give your team a clear path to success. Compass is a web-based platform teams use to streamline their workflows and business processes.