SASS-Tools is a project mainly written in ..., it's free.
Some SASS stylesheets to smooth browser oddities.
A direct port of Eric Meyer's reset.css file to SASS. His original lives here: http://meyerweb.com/eric/tools/css/reset/
SASS helper functions to ease the use of some shiny new CSS3 rules.
A quick example:
div#page +border-radius(5px, 10px, 5px, 10px) +box-shadow(#000, 0px, 3px, 5px) +gradient(#00baff, #00baff-#111) +box-sizing(border-box)