LESS-CSS
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LESS is a cool project that has been around for a while and extends CSS with a few nice features like variables, mixins, operations and nested rules. The best thing about it is the syntax that feels very natural and easy to learn.
Blog - LESS for Java
SimpLESS - Your LESS CSS Compiler
Writing LESS is cool and lightning fast if you compare it to good old CSS and besides, it trains your thinking in solving functional problems.