Sass

Syntatically Awesome Style Sheets

17 Alternatives To Sass

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Bootstrap

Simple and flexible HTML, CSS, and JS for popular UI components and interactions
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Bourbon

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

Use tomorrow’s CSS syntax, today.

CSS-Crush

A standards inspired CSS pre-processor. Written in PHP.

Compass Workflow

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

The most advanced responsive front-end framework in the world
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Garden (Clojure)

Unlike the mini-languages that are other pre/post-processor options, Garden leverages the full power of the Clojure programming language for CSS.

Less

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).

Moar

Moar is a pager. It’s designed to be easy to use and just do the right thing without any…

Pleeease

Pleeease is a Node.

Rework

Let’s Make Work Better. Research, ideas, and practices from Google and others, to put people first.

Semantic UI

A UI Component library implemented using a set of specifications designed around natural language

Sly

:smirk: Making CSS Better. Contribute to kbrsh/sly development by creating an account on GitHub.

Stylecow

CSS processor to fix your css code and make it compatible with all browsers

Stylus

Stylus Studio is a fully featured and comprehensive suite for editing and developing in XML.
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UIKit

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

:rainbow: Node.js bindings to libsass. Contribute to sass/node-sass development by creating an account on GitHub.