Kamran Ahmed has developed this light-weight, no-dependency, vanilla JavaScript engine to drive user's focus across the page.

Easily create sites that work offline as well as online. UpUp is a tiny JavaScript library that makes sure your users can always access your site's content, even when they're on a plane, in an elevator, or 20,000 leagues under the sea.

basicScroll allows you to change CSS variables depending on the scroll position. Use the variables directly in your CSS to animate whatever you want.