Responsive framework overview

Compass is an extension of Sass (as in Compass requires Sass). It has its own compiler (instead of sass --watch, you use compass watch). It has a large collection of mixins and functions that you'll find incredibly useful (while commonly pointed to for generating vendor prefixed CSS3 properties, it can do things like automatically generate spritemaps and the CSS to go with them). Compass is also built in such a way that you can bundle your own bootstrap type library for easily deploying in multiple projects without the need to copy/paste the source for it in each one.

Learn more about Sass via http://thesassway.com/

Grunt is a javascript application which automates tasks. Grunt itself acts as the engine and is extended to perform specific tasks through adding Grunt plugins. These are configured in Gruntfile.js and run from the command line. Tasks which Grunt can be configured to perform include javascript concatenation and minification, SASS / Compass watching and compilation, compress images, combine image sprites, FTP and many others. Grunt is part of the Zurb Foundation installation so will already be in place if Foundation is installed.

Learn more about Grunt via http://gruntjs.com/