Bliss.js : Want to use Vanilla JS but find native APIs a bit unwieldy? Bliss is for you
Rickshaw : Rickshaw is a JavaScript toolkit for creating interactive time series graphs.
Leaflet : A Modern, Lightweight Open-Source JavaScript Library for Interactive Maps
css3-mediaqueries-js : make CSS3 Media Queries work in all browsers (JavaScript library)
swfobject : SWFObject 2 offers two optimized Flash Player embed methods; a markup based approach and a method that relies on JavaScript & offers a JavaScript API ...
Modest Maps is a small, extensible, and free library for designers and developers who want to use interactive maps in their own projects.