Build beautiful, usable products faster. Material Design is an adaptable system—backed by open-source code—that helps teams build high quality digital experiences.

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.

… 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.

The Google Font Directory lets you browse all the fonts available via the Google Font API. All fonts in the directory are available for use on your website under an open source license and are served by Google servers.

the most well-made, free & open-source, @font-face ready fonts