CSS Preprocessors
CSS preprocessors allow you to create stylesheets using a language-neutral format instead of writing CSS in plain text. This means that you can share your stylesheets and use them across projects without having to worry about how they were written or if they are valid CSS.
SASS & LESS
Sass and LESS are two popular CSS preprocessors, but there are many others out there. SASS is a superset of CSS3, with additional features like variables, mixins and functions built into the language itself. It's also more powerful than LESS when it comes to creating custom functions like map() or reduce().
Stylus
Stylus adds syntax highlighting to your editor so that you can easily see what's going on inside your code. It also provides a number of useful functions such as find() and replace().
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