CSS Next - Use tomorrow’s CSS syntax, today.
Sass - Syntatically Awesome Style Sheets
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.
Open Startups Initiative - Real-time revenue metrics of transparent startups
Stylus - EXPRESSIVE, DYNAMIC, ROBUST CSS
Product Comparisons - Compare any 2 software products