MaintainableCSS : Write CSS without worrying that overzealous, pre-existing styles will cause problems. MaintainableCSS is an approach to writing modular, scalable and ...
HyperTerm : A terminal built on web technologies : JS / HTML / CSS
UIkit : A lightweight and modular front-end framework
for developing fast and powerful web interfaces.
Fontdeck : Fontdeck is standards compliant, accessible and uses a pure CSS @font-face solution. No JavaScript required.
Diagnostic.css : Diagnostic.css is a stylesheet which allows the user to test for common errors in a page's markup.
Also : https://github.com/karlgroves/diagnostic.css
Reasonable System for CSS Stylesheet Structure.
A set of simple ideas to guide your process of building maintainable CSS.