Selectivizr
Selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8.
Screenfull.js
Simple wrapper for cross-browser usage of the JavaScript Fullscreen API
Px Loader
PxLoader is a simple JavasScript library for creating preloaders and resource downloaders for HTML5 apps.
Mixitup
A CSS3 and jQuery Filter & Sort Plugin
LScache
A localStorage-based memcache-inspired client-side caching library.
Izi Toast
Elegant, responsive, flexible and lightweight notification plugin with no dependencies.
Featherlight
Featherlight is a very lightweight jQuery lightbox plugin. It's simple yet flexible and easy to use. Featherlight has minimal css and uses no inline styles, everything is name-spaced, it's completely customizable via config object and offers image, ajax and iframe support out of the box. Featherlights small footprint weights about 4kB – in total.
Sherlock
Natural-language event parser for Javascript
Jumly
Rendering engine for UML diagrams in JavaScript
Filereader.js
A lightweight wrapper for the JavaScript FileReader interface
Twitter Post Fetcher
Fetch your twitter posts without using the new Twitter 1.1 API. Pure JavaScript! By Jason Mayes
Set Dom
📑 Lightweight dom diffing with plain old html.
Purl
A JS utility for for parsing URLs and extracting information out of them.
Custombox
Modal Window Effects with transitions CSS3.
CSS3 Pie
A behavior for Internet Explorer allowing it to recognize and render various CSS3 box decoration properties
Sugar
A Javascript library for working with native objects.
Stimulus
A modest JavaScript framework for the HTML you already have