Tether (Newest)
Tether is a JavaScript library for efficiently making an absolutely positioned element stay next to another element on the page. For example, you might want a tooltip or dialog to open, and remain, next to the relevant item on the page. Tether includes the ability to constrain the element within... More information
Modernizr (Newer)
Modernizr adds classes to the <html> element which allow you to target specific browser functionality in your stylesheet. You don't actually need to write any Javascript to use it. Modernizr is a small and simple JavaScript library that helps you take advantage of emerging web technologies... More information