Hello.js
A Javascript RESTFUL API library for connecting with OAuth2 services, such as Google+ API, Facebook Graph and Windows Live Connect
Conditioner
Frizz Free, Environment-aware, JavaScript Modules
Scale App
scaleApp is a JavaScript framework for scalable One-Page-Applications
Boomerang
End user oriented web performance testing and beaconing
X3dom
X3DOM. A framework for integrating and manipulating X3D scenes as HTML5/DOM elements.
Pegasus
Load data while still loading other scripts and display data faster in jQuery, Backbone, Angular, ... apps
Midi Writer Js
♬ JavaScript library providing an API for programmatically generating expressive multi-track MIDI files in browser and Node.
jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Weld
Template antimatter for Node.js (Browsers too!)
TweenJs
A simple but powerful tweening / animation library for Javascript. Part of the CreateJS suite of libraries.
Tock
Timer Object/Class. Kickass!
Terrificjs
Terrific JavaScript Framework
Nivo Slider
The Most Awesome jQuery Image Slider
Ladda
Buttons with built-in loading indicators.
Green Sock Js
Public repository for GreenSock's JavaScript libraries like GSAP. See http://www.greensock.com
Easel JS
The Easel Javascript library provides a full, hierarchical display list, a core interaction model, and helper classes to make working with the HTML5 Canvas element much easier.
D3 Cloud
Create word clouds in JavaScript.