CSS-Crush - A standards inspired CSS pre-processor. Written in PHP.
CSS Next - Use tomorrow’s CSS syntax, today.
W3M - w3m is a text-based web browser as well as a pager like ' ...
Garden (Clojure) - Unlike the mini-languages that are other pre/post-processor options, Garden leverages the full power of the Clojure programming language for CSS.
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS
PostCSS - Increase code readability. Add vendor prefixes to CSS rules using values from Can I Use. Autoprefixer will use the data based on current browser popularity and property support to apply prefixes for you.