Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Dragula
:ok_hand: Drag and drop so simple it hurts
Aurora
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Phantomjs
Scriptable Headless WebKit
Laconic
Sane DOM Generation
jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Gator
Event delegation in Javascript
Cortex
A javascript library for centrally managing data with React
Vissense
A utility library for observing visibility changes of DOM elements.
Wow
Reveal CSS animation as you scroll down a page
jScrollPane
Pretty, customisable, cross browser replacement scrollbars
jQuery.nicescroll
nicescroll plugin for jquery - scrollbars like iphone/ipad
Slim.js
Fast & Robust Front-End Micro-framework based on modern standards
Prefixfree
Break free from CSS prefix hell!
Bonzo
library agnostic, extensible DOM utility
Polymer
Leverage the future of the web platform today.
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.