YUI3
YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.
Content Tools
A JS library for building WYSIWYG editors for HTML content.
Broccoli
Browser compilation library – a build tool for applications that run in the browser
Elevator.js
Finally, a "back to top" button that behaves like a real elevator.
Processing.js
A port of the Processing visualization language to JavaScript.
Polyglot.js
Give your JavaScript the ability to speak many languages.
Csscomb.js
CSS coding style formatter
Granim.js
Create fluid and interactive gradients animations with this small (< 10 kB) js library.
Faye
Simple pub/sub messaging for the web
Devextreme Reactive
DevExtreme Reactive Components
Hogan.js
A compiler for the Mustache templating language
Epoch
A general purpose, real-time visualization library.
Tilt.js
A tiny 60+fps parallax tilt hover effect for jQuery.
Kinetic Js
KineticJS is an HTML5 Canvas JavaScript library that extends the 2D context by enabling canvas interactivity for desktop and mobile applications.
Angular Meteor
Combining the simplicity and power of AngularJS and Meteor
Dynamics.js
Javascript library to create physics-based CSS animations