Veinjs
Injects CSS into the document (it's a perfectly legal procedure)
Prefixfree
Break free from CSS prefix hell!
Phantomjs
Scriptable Headless WebKit
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.
Gator
Event delegation in Javascript
jQuery.lazy
A lightweight, fast, feature-rich, powerful and highly configurable delayed content, image and background lazy loading plugin for jQuery & Zepto.
Eqcss
EQCSS is a plugin that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up
Turbolinks
Turbolinks makes navigating your web application faster
jScrollPane
Pretty, customisable, cross browser replacement scrollbars
Voyeur.js
Voyeur is a tiny (1.2kb) Javascript library that lets you traverse and manipulate the DOM the way it should have been.
Node List.js
NodeList implementation/library - Use the Native DOM APIs as easily as jQuery
Nested
Gap free multi column grid
Do Mtastic
Small & fast DOM and event library for modern browsers.
jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Responsive Comments
A client-side solution to conditional loading.
Html
A simple, extensible way to work directly with the DOM.
Gliojs
Exit popup easely. Detects if the mouse of a user leaves the viewport borders of your website