EmberJS - JavaScript framework for creating ambitious web applications

Ember.js (formerly SproutCore 2.0) is a JavaScript framework that does all of the heavy lifting that you'd normally have to do by hand. There are tasks that are common to every web app; Ember.js does those things for you, so you can focus on building killer features and UI.
These are the three features that make Ember.js a joy to use: Bindings, Computed properties, Auto-updating templates