https://developers.google.com/speed/libraries/
Content Delivery Network
Everyone loves the Google CDN right? Even Microsoft runs their own CDN. The problem is, they only host the most popular libraries. We host it all - JavaScript, CSS, SWF, images, etc!
HTML is great for declaring static documents, but it falters when we try to use it for declaring dynamic views in web-applications. AngularJS lets you extend HTML vocabulary for your application. The resulting environment is extraordinarily expressive, readable, and quick to develop.
Meteor is an open-source platform for building top-quality web apps in a fraction of the time, whether you're an expert developer or just getting started.
CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way.
jQuery UI is a curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library. Whether you're building highly interactive web applications or you just need to add a date picker to a form control, jQuery UI is the perfect choice.
A pure-JavaScript CSS selector engine designed to be easily dropped in to a host library.
jQuery Mobile is a touch-optimized web framework (additionally known as a JavaScript library or a mobile framework) currently being developed by the jQuery project team. The development focuses on creating a framework compatible with a wide variety of smartphones and tablet computers,[2] made necessary by the growing but heterogeneous tablet and smartphone market.[3] The jQuery Mobile framework is compatible with other mobile app frameworks and platforms such as PhoneGap, Worklight[4] and more.
Dojo saves you time and scales with your development process, using web standards as its platform. It’s the toolkit experienced developers turn to for building high quality desktop and mobile web applications. From simple websites to large packaged enterprise applications whether desktop or mobile, Dojo will meet your needs.
http://www.sencha.com/products/extjs
JavaScript Framework Sencha Ext JS is the leading standard for business-grade web application development. With over 100 examples, 1000 APIs, hundreds of components, a full documentation suite and built in themes, Ext JS provides the tools necessary to build robust desktop applications.
RESTful JSON interface - model-view-presenter
MooTools is a compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer. It allows you to write powerful, flexible, and cross-browser code with its elegant, well documented, and coherent API.
Javascript Framework. Prototype takes the complexity out of client-side web programming. Built to solve real-world problems, it adds useful extensions to the browser scripting environment and provides elegant APIs around the clumsy interfaces of Ajax and the Document Object Model.
script.aculo.us is a JavaScript library built on the Prototype JavaScript Framework, providing dynamic visual effects and user interface elements via the Document Object Model (DOM). It is most notably included with Ruby on Rails and Seaside, but also provided separately to work with other web application frameworks and scripting languages.
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser. Taking advantage of cool new web technologies is great fun, until you have to support browsers that lag behind. Modernizr makes it easy for you to write conditional JavaScript and CSS to handle each situation, whether a browser supports a feature or not. It’s perfect for doing progressive enhancement easily.
Simplify dynamix JavaScript Ui's by applying the Model-View-View Model (MVVM) pattern.
RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino and Node. Using a modular script loader like RequireJS will improve the speed and quality of your code.
Underscore is a utility-belt library for JavaScript that provides a lot of the functional programming support that you would expect in Prototype.js (or Ruby), but without extending any of the built-in JavaScript objects. It's the tie to go along with jQuery's tux, and Backbone.js's suspenders.
Underscore provides 80-odd functions that support both the usual functional suspects: map, select, invoke — as well as more specialized helpers: function binding, javascript templating, deep equality testing, and so on. It delegates to built-in functions, if present, so modern browsers will use the native implementations of forEach, map, reduce, filter, every, some and indexOf.
selectivizr is a JavaScript utility that emulates CSS3 pseudo-classes and attribute selectors in Internet Explorer 6-8. Simply include the script in your pages and selectivizr will do the rest.
http://techslides.com/50-javascript-charting-and-graphics-libraries/
Interactive Javascript charts for your webprojects
https://developers.google.com/chart
Completely free and with 3 years backward compatability guaranteed
http://dojotoolkit.org/features/graphics-and-charting
Cross Platform Vector Graphics GFX provides a cross-browser high-level graphics API that hides the browser rendering engine specificities, and supports a wide range of technologies out of the box (SVG, VML, Canvas, Silverlight and SVGWeb), both on the desktop or mobile. When the application is loaded, GFX selects the best graphics engine implementation to use depending on the browser capabilities.
JustGage is a handy JavaScript plugin for generating and animating nice & clean gauges. It is based on Raphaël library for vector drawing, so it’s completely resolution independent and self-adjusting. Oh yes, since it’s pure SVG, it works in almost any browser - IE6+, Chrome, Firefox, Safari, Opera, Android, etc.