Packery
bin-packing layout library
Wow
Reveal CSS animation as you scroll down a page
Zepto
Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API
Do Mtastic
Small & fast DOM and event library for modern browsers.
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Phantomjs
Scriptable Headless WebKit
Nested
Gap free multi column grid
Cortex
A javascript library for centrally managing data with React
Gator
Event delegation in Javascript
Vissense
A utility library for observing visibility changes of DOM elements.
Bespoke.js
DIY Presentation Micro-Framework
Prefixfree
Break free from CSS prefix hell!
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.
Cyclejs
A functional and reactive JavaScript framework for predictable code
jQuery.nicescroll
nicescroll plugin for jquery - scrollbars like iphone/ipad
Bonzo
library agnostic, extensible DOM utility
Polymer
Leverage the future of the web platform today.