less -Â The dynamic stylesheet language.
LESS extends CSS with dynamic behavior such as variables, mixins, operations and functions. LESS runs on both the client-side (IE 6+, Webkit, Firefox) and server-side, with Node.js.
Ender – a full featured package manager for your browser.
It allows you to search, install, manage, and compile front-end javascript packages and their dependencies for the web. We like to think of it as NPM‘s little sister.
TWITTER BOOTSTRAP
Bootstrap is Twitter’s toolkit for kickstarting CSS for websites, apps, and more. It includes base CSS styles for typography, forms, buttons, tables, grids, navigation, alerts, and more.