Gator
Event delegation in Javascript
Rainbow
Simple syntax highlighting library written in javascript
Flexi Color Picker
A pure JavaScript color picker - no images, external libraries, CSS or 1px divs.
Grapnel.js
A simple, lightweight library making it easy to create routes or run events based on a specific URL hashtag.
Enyo
A JavaScript application framework emphasizing modularity and encapsulation
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Hammer.js
A javascript library for multi-touch gestures // You can touch this
Kinetic Js
KineticJS is an HTML5 Canvas JavaScript library that extends the 2D context by enabling canvas interactivity for desktop and mobile applications.
Typecast.js
Typecast.js :: Solving the simple problems
Bootstrap Tour
Quick and easy product tours with Twitter Bootstrap Popovers
Jquery Zoomer
Zoom up your iFrames
Mincss
Tool for finding out which CSS selectors you're NOT using.
Move.js
CSS3 backed JavaScript animation framework
Gfx
CSS3 3D animation library
TweenJs
A simple but powerful tweening / animation library for Javascript. Part of the CreateJS suite of libraries.
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Sylvester
Vector, matrix and geometry math JavaScript