jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Node List.js
NodeList implementation/library - Use the Native DOM APIs as easily as jQuery
Aurora
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Phantomjs
Scriptable Headless WebKit
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.
Laconic
Sane DOM Generation
Gator
Event delegation in Javascript
Zepto
Zepto.js is a minimalist JavaScript library for modern browsers, with a jQuery-compatible API
Packery
bin-packing layout library
Cortex
A javascript library for centrally managing data with React
Slim.js
Fast & Robust Front-End Micro-framework based on modern standards
Vissense
A utility library for observing visibility changes of DOM elements.
jScrollPane
Pretty, customisable, cross browser replacement scrollbars
jQuery.nicescroll
nicescroll plugin for jquery - scrollbars like iphone/ipad
Prefixfree
Break free from CSS prefix hell!
Bonzo
library agnostic, extensible DOM utility
Polymer
Leverage the future of the web platform today.