Bespoke.js
DIY Presentation Micro-Framework
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
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.
Packery
bin-packing layout library