jQuery

Chaplin is an architecture for JavaScript applications using the Backbone.js library. Chaplin addresses Backbone’s limitations by providing a lightweight and flexible structure that features well-proven design...

Free web application framework for building Web sites and Web applications using JavaScript, HTML and CSS.

MochiKit is a highly documented and well tested suite of JavaScript libraries that will help you get things done, fast. It takes good ideas found in Python, Objective-C, etc. and …

Sails.js make it easy to build custom, enterprise-grade Node.js apps. It is designed to mimic the MVC pattern of frameworks like Ruby on Rails, but with support for the requirements …

Nombo is an Open Source Node.js framework that allows you to easily build Rich Cloud Applications.

A pure-JavaScript CSS selector engine designed to be easily dropped in to a host library, for the open source JavaScript library jQuery.

Vanilla JS is a fast, lightweight, cross-platform framework for building incredible, powerful JavaScript applications.

Spine - Build Awesome JavaScript MVC Applications

Small & fast DOM and event library for modern browsers. Having the same familiar API as jQuery (but without the extra "weight" of modules like $.ajax, $.animate, and $.Deferred), it …

An opinionated, battle-tested Backbone + Handlebars framework to build large scale web applications.

MathJax is an open source JavaScript display engine for mathematics that works in all modern browsers, using LaTeX math and MathML markup.

Zepto is a minimalist JavaScript library for modern browsers with a largely jQuery-compatible API.

Polymer is a new type of library for the web, built on top of Web Components, and designed to leverage the evolving web platform on modern browsers.

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...

The Harp Platform is the easiest way for anyone to create an exceptional website. Landing Pages, galleries, blogs, e-commerce, domains, hosting, analytics, 24/7 support - all included.

Popcorn.js is an HTML5 media framework written in JavaScript for filmmakers, web developers, and anyone who wants to create time-based interactive media on the web. Popcorn.js is part of Mozilla's …

Mojito - A JavaScript MVC application framework that runs in either a Node.js or browser environment.

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 …

Yaf is the first PHP MVC framework which is written in C and built as PHP extension. It is considered the fastest and the lowest resource consuming PHP framework for …

Lo-Dash is a drop-in replacement for Underscore.js that delivers performance improvements, bug fixes, and additional features. Lo-Dash’s performance is gained by avoiding slower native methods, instead...

YUI is a free, open source JavaScript and CSS library for building richly interactive web applications.