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).
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Alternatives to LESS
PostCSS
Free
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
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Stylus
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Stylus Studio is a fully featured and comprehensive suite for editing and developing in XML.
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Rework
Let's Make Work Better. Research, ideas, and practices from Google and others, to put people first.
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