Chai
BDD / TDD assertion framework for node.js and the browser that can be paired with any testing framework.
X Editable
In-place editing with Twitter Bootstrap, jQuery UI or pure jQuery
Jo
Jo is a thin (~12K) candy shell for PhoneGap apps. It's an HTML5 mobile app framework which provides UI widgets, a flexible event model, a wrapper for sound, and a light data layer. Apps are skinnable with CSS3, and work everywhere PhoneGap does... and then some, including Adobe Air and OSX (desktop and dashboard).
Gridster.js
gridster.js is a jQuery plugin that makes building intuitive draggable layouts from elements spanning multiple columns
Inkline
Inkline is the customizable Vue.js UI/UX Library designed for creating flawless responsive websites.
Pico Modal
A small, self-contained JavaScript modal library
Flac.js
FLAC decoder in JavaScript
Abaaso
A modern, lightweight enterprise-class RESTful JavaScript application framework.
Refraction
A guard that represents a central point of control in your application
Is Near
Calculates if the mouse position is near to a given element.
Rusha
High-performance pure-javascript SHA1 implementation suitable for large binary data, reaching up to half the native speed.
Responsive Nav.js
Responsive navigation plugin without library dependencies and with fast touch screen support.
React Virtualized
React components for efficiently rendering large lists and tabular data
Natural Regex
Create regex from natural language
Morris.js
Pretty time-series line graphs
Morpheus
A Brilliant Animator
Marka
Beautiful transformable icons built for the web.