Sass has plugins that cover most of the CSS "frameworks" but to my knowledge doesn't have a lot of fully developed themes. The advantage to using a preprocessor

Sass has plugins that cover most of the CSS "frameworks" but to my knowledge doesn't have a lot of fully developed themes. The advantage to using a preprocessor is that you can apply the built in styles to the classes/ids of your choice instead of having to use the same ones the css framework uses.