Sass

Sass is a meta-language on top of CSS that’s used to describe the style of a document cleanly and structurally, with more power than flat CSS allows. Sass both provides a simpler, more elegant syntax for CSS and implements various features that are useful for creating manageable stylesheets.

The Sass Team

Sass was originally created by Hampton Catlin. He and Nathan Weizenbaum designed Sass through version 2.0. Hampton lives in Jacksonville, Florida and is the lead mobile developer for Wikimedia.
Chris Eppstein joined the Sass team in late 2008. He and Nathan have designed Sass from version 2.2 on. Chris is the creator of Compass, the first Sass-based framework. Chris lives in San Jose, California with his wife and daughter. He is the Software Architect for Caring.com, a website devoted to the thirty-four million caregivers whose parents are sick or elderly.
Nathan Weizenbaum is the primary designer of Sass, and has been the main developer since its inception. He lives in Seattle, Washington and will be going to work for Google once he finishes his last year at the University of Washington.

License

Sass is available under the MIT License.

 sample

// Variable Definitions

$page-width:    800px;
$sidebar-width: 200px;
$primary-color: #eeeeee;

// Global Attributes

body {
  font: {
    family: sans-serif;
    size: 30em;
    weight: bold;
  }
}

// Scoped Styles

#contents {
  width: $page-width;
  #sidebar {
    float: right;
    width: $sidebar-width;
  }
  #main {
    width: $page-width - $sidebar-width;
    background: $primary-color;
    h2 { color: blue; }
  }
}

#footer {
  height: 200px;
}




http://sass-lang.com/