Sass is a scripting langauage that is interpreted into CSS. Sass stands for Syntatically Awesome Stylesheets. Sass consists of two syntaxes. The original syntax, called “the indented syntax”, uses a syntax similar to Haml. It uses indentation to separate code blocks and newline characters to separate rules.

Sass enables your you to separate your stylesheets into individual files, and then you can use the @import directive to include your individual files into one master stylesheet.

ZURB’s Foundation framework is a feature-rich, easy to implement, light weight framework for designing responsive web applications. Designed with mobile-first approach in mind, it comes packed with CSS3 media queries, The Grid, reusable HTML5 components and several jQuery plugins to aid interactivity.

Native CSS variable support is still in its infancy, but Sass affords us a way to set reusable values.

SMACSS stands for Scalable and Modular Architecture for CSS. It is pronounced “smacks” and introduced by Jonathan Snook.