Compass CSS

Compass is an open-source CSS Authoring Framework.

6 Alternatives To Compass CSS

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Bourbon

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

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

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).

Sass

Syntatically Awesome Style Sheets

Stylus

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