Sass : Syntactically Awesome Style Sheets ..
Sass is the most mature, stable, and powerful professional grade CSS extension language in the world.
Sass is completely compatible with all versions of CSS. We take this compatibility seriously, so that you can seamlessly use any available CSS libraries.
Sass boasts more features and abilities than any other CSS extension language out there. The Sass Core Team has worked endlessly to not only keep up, but stay ahead.
Sass has been actively supported for almost 8 years by its loving Core Team.
Over and over again, the industry is choosing Sass as the premier CSS extension language.
Sass is actively supported and developed by a consortium of several tech companies and hundreds of developers.
There are endless number of frameworks built with Sass. Compass, Bourbon, and Susy just to name a few.