ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Magic
CSS3 Animations with special effects
Device.js
Device.js makes it easy to write conditional CSS and/or JavaScript based on device operating system (iOS, Android, Blackberry, Windows, Firefox OS), orientation (Portrait vs. Landscape), and type (Tablet vs. Mobile).
LZ String
LZ-based compression algorithm for JavaScript
Vex
A modern dialog library which is highly configurable and easy to style. #hubspot-open-source
G2 Plot
:dango: An interactive and responsive charting library
Hello.js
A Javascript RESTFUL API library for connecting with OAuth2 services, such as Google+ API, Facebook Graph and Windows Live Connect
Qunit
An easy-to-use JavaScript Unit Testing framework.
Framer
Modern Prototyping Tool
Loki JS
javascript embedded / in-memory database
Lightgallery.js
Full featured javascript lightbox gallery. No dependencies.
Stream Saver.js
StreamSaver writes stream to the filesystem directly asynchronous
Remarkable
Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one.
Open Jscad.org
OpenSCAD + JavaScript = OpenJSCAD, edit locally or remote online, preview in browser direct via WebGL.
Jquery Transit
Super-smooth CSS3 transformations and transitions for jQuery
Metrics Graphics
A library optimized for concise, principled data graphics and layouts.
Bootstrap Tour
Quick and easy product tours with Twitter Bootstrap Popovers