Crawl website to find unused CSS selectors, as well as duplicate selectors.
Basic features:
Find unused CSS selectors, given a HTML code base.
Find duplicate CSS selectors.
Count matches for each rule.
Follows links (crawl), within the given domain.

Imager.js is an alternative solution to the issue of how to handle responsive image loading, created by developers at BBC News.

animate.css is a bunch of cool, fun, and cross-browser animations for you to use in your projects. Great for emphasis, home pages, sliders, and general just-add-water-awesomeness.