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Sass (+Scss) http://sass-lang.com/
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Less http://lesscss.org/
[CSS < Sass < Compass Illustration](http://f.cl.ly/items/032r1e2z3p2n1s361U2k/CSS(Sass(Compass.jpg)
Sass & Compass: The future of stylesheets now by Brandon Mathis
Help! My Stylesheets are a Mess!
SASS and Compass for Web Designers: Grids and Sprites
Sass vs. LESS vs. Stylus: Preprocessor Shootout
- @Compass_Recipes, CSS recipes using Sass & Compass http://moox.github.com/compass-recipes/
- Susy, Responsive grids for Compass http://susy.oddbird.net/
- Even more : extensions Sass, extensions Compass