Ember.js is a JavaScript framework for creating ambitious web applications. It provides a complete solution for quickly building ambitious web applications, from rendering templates to routing and data management. It's designed for developer productivity and ease of use.
Meteor is an open-source platform for web, mobile, and desktop used by over half a million developers around the globe. Meteor makes shipping Javascript applications efficient and scalable. Sign up for your free Meteor Cloud account today!
Backbone.js is a lightweight JavaScript library that provides structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions, views with declarative event handling, and connects it all to your existing API over a RESTful JSON interface.