“Compass is an open-source CSS Authoring Framework.” – Compass
“Compass can do some really handy tasks like measuring images from the filesystem and writing them into your stylesheets. Asset URL functions are available that make it easy to move assets around in a project or even switch to a content delivery network (CDN) without having to rewrite your stylesheets. Compass can even combine a directory of images into a single sprite image and do the otherwise tedious task of calculating coordinates and writing the spriting CSS for you.” – Sass and Compass in Action (Manning)
Adeline Yaw - Happiness Engineer @ Automattic 