What is Knockout JS?

Knockout is a JavaScript library that helps you to create rich, responsive display and editor user interfaces with a clean underlying data model. Any time you have sections of UI that update dynamically (e.g., changing depending on the user’s actions or when an external data source changes), KO can help you implement it more simply and maintainably.
Headline features:

• Elegant dependency tracking - automatically updates the right parts of your UI whenever your data model changes.
• Declarative bindings - a simple and obvious way to connect parts of your UI to your data model. You can construct a complex dynamic UIs easily using arbitrarily nested binding contexts.
• Trivially extensible - implement custom behaviors as new declarative bindings for easy reuse in just a few lines of code.

Additional benefits:

• Pure JavaScript library - works with any server or client-side technology
• Can be added on top of your existing web application without requiring major architectural changes
• Compact - around 13kb after gzipping
• Works on any mainstream browser (IE 6+, Firefox 2+, Chrome, Safari, others)
• Comprehensive suite of specifications (developed BDD-style) means its correct functioning can easily be verified on new browsers and platforms

For more visit knockoutjs.com/ 

Sencha Touch, Build for Mobile

Sencha Touch bunch is the industry’s first HTML 5 product suite that provides phone developers with the JavaScript framework, development tools, and business class support they need to build fully touch based apps in a single, integrated package.

 Modern HTML5 App Dev for the Desktop

Sencha Ext JS is the industry's most powerful desktop application development platform with unparalleled cross-browser compatibility, advanced MVC architecture, plugin-free charting, and modern UI widgets.

What is Sencha Ext. JS?

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. Ext JS also brings a rich data package that allows developers to use a model-view-controller (MVC) architecture when building their app. The MVC leverages features like Big Data Grids enabling an entirely new level of interactivity in web apps.

Cross Browser Compatibility

Ext JS 4 lets developers deliver on an incredible variety of browsers and on more operating systems using the same code — over ten years of browsers in one release. On modern browsers, Ext JS 4 utilizes HTML5 features and falls back to alternatives on older browsers. Whether you’re using Ext JS’ built-in UI components, using the Charting package, or theming your application, Ext JS 4 makes it easy to build an app that gives you the power of the web regardless of what browser your customer uses.
Ext JS supports all major web browsers including:

Internet Explorer 6+
Firefox 3.6+ (PC, Mac)
Safari 4+
Chrome 10+
Opera 11+ (PC, Mac)