MVP.css - Minimalist stylesheet for HTML elements
Themes by Anders Norén
WordPress themes for bloggers, photographers, designers and businesses. All of them are fully featured, open source and completely free.
Compass.app
compile Compass/Sass easily without resorting to command line interface — Compass.app helps designers compile stylesheets easily without resorting to command line interface. It is written in Java and works in Windows/Linux/Mac OS X.
Compass
… is a stylesheet authoring framework that makes your stylesheets and markup easier to build and maintain. With compass, you write your stylesheets in Sass instead of CSS.