Provides: Models, Collections (of model instances), Views (with declarative event handling). REST API support is baked in.

Interesting approach to MVC: each $$() object has its own model-view-controller stack. Model holds underlying data, view contains DOM template, controller takes care o event handling.

A love child of Backbone.js and Knockout.js, taking the best features from each one.

"Web application framework for a frontend built using RequireJS, Backbone.js, Underscore.js, jQuery, Mustache.js"

Details here: http://www.hautelooktech.com/2012/05/24/vertebrae-front-end-framework-built-with-backbone-js-and-requirejs-using-amd/

Interesting approach: add framework hooks in DOM, invent new HTML elements etc. Works with other libraries/frameworks.

"Batman.js is a framework for building rich web applications with CoffeeScript or JavaScript. App code is concise and declarative, thanks to a powerful system of view bindings and observable properties. The API is designed with developer and designer happiness as its first priority."

Library that allows binding of DOM elements to model data via HTML data attributes, implements Model-View-View-Model architecture, supports templating.

Micro-framework written in CoffeeScript, provides Classes, Models, Views, Controllers, can also handle Routes. Seems to be largely inspired from Backbone.js.

Ember takes the good ideas from SproutCore 1.x (Data Binding, State Charts), adds Handlebars.js templating.

Classes, MVC, routing.

"Meteor is a set of new technologies for building top-quality webapps in a fraction of the time, whether you're an expert developer or just getting started."

"Mojito is a sweet (and minty!) MVC application framework built on YUI 3 that enables agile development of Web applications. Mojito allows developers to write client and server components in the same language (JavaScript), using the same framework. Because Mojito applications are written in JavaScript, they can run on the client (in the browser) and on the server (with Node.js). In addition, Mojito has built-in support for internationalization, testing, and building documentation."

"Enyo is an open source object-oriented JavaScript framework emphasizing encapsulation and modularity. Enyo contains everything you need to create a fast, scalable mobile or web application."

ExtJS-style declarative UI.

"PhoneGap is an HTML5 app platform that allows you to author native applications with web technologies and get access to APIs and app stores. PhoneGap leverages web technologies developers already know best... HTML and JavaScript."

"Zepto.js is a minimalist JavaScript framework for modern web browsers*, with a jQuery-compatible syntax. The goal: a 5-10k library that handles most basic drudge work with a nice API so you can concentrate on getting stuff done.

Zepto's primary focus is on mobile devices, where small file sizes and tapping into the latest browser features matter most for fast loading and optimal runtime performance.

*Zepto supports Safari, Chrome, Firefox and Opera and any mobile WebKit-based browser, including iOS Mobile Safari, Android browser, HP webOS browser, Blackberry Tablet OS browser and others. Zepto does not support Internet Explorer."

"Impact is a JavaScript Game Engine that allows you to develop stunning HTML5 Games for desktop and mobile browsers."

"Sane defaults and a simple structure, scaling as your application grows. Matador is a clean, organized framework for Node.js architected to suit MVC enthusiasts. It gives you a well-defined development environment with flexible routing, easy controller mappings, and basic request filtering. It’s built on open source libraries such as Hogan.js for view rendering, Klass for its inheritance model, Valentine for functional development, and Express to give a bundle of other Node server related helpers."

"Paper.js is an open source vector graphics scripting framework that runs on top of the HTML5 Canvas. It offers a clean Scene Graph / Document Object Model and a lot of powerful functionality to create and work with vector graphics and bezier curves, all neatly wrapped up in a well designed, consistent and clean programming interface.

Paper.js is based on and largely compatible with Scriptographer, a scripting environment for Adobe Illustrator with an active community of scripters and more than 10 years of development.

Paper.js is developed by Jürg Lehni & Jonathan Puckey, and distributed under the permissive MIT License."

"Treesaver is a JavaScript framework for creating magazine-style layouts using standards-compliant HTML and CSS."

"JavaScriptMVC is an open-source framework containing the best ideas in jQuery development.

It guides you to successfully completed projects by promoting best practices, maintainability, and convention over configuration."

"A super micro tiny DOM library for authoring HTML5 mobile web applications."

"Claypool is a small, fast, railable Javascript Application Framework , built on jQuery that provides all the usual important patterns for large, long-lived client-side apps, server-side apps, or something strangely, beautifully in the middle."