Vex : Vex is a modern dialog library which is highly configurable, easily stylable, and gets out of the way. You'll love vex because it's tiny (6kb minified...
Headroom.js : Headroom.js is a lightweight, high-performance JS widget (with no dependencies!) that allows you to react to the user's scroll.
Sammy.js : Sammy is a tiny javascript framework built on top of jQuery, It's RESTful Evented Javascript.
Rickshaw : Rickshaw is a JavaScript toolkit for creating interactive time series graphs.
jQuery Masonry : A dynamic layout plugin for jQuery
The flip-side of CSS floats
