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jQuery: The Write Less, Do More, JavaScript Library
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The developers at Sproutit originally came up with SproutCore , a complete framework for building rich Internet applications, because they wanted to rewrite their first application, Mailroom , to run completely via the browser. Since the framework is open source, anyone can freely take advantage of the framework to build desktop-quality applications that run in all major browsers. Anyone, including Apple. The fact that SproutCore offered a complete application development framework was important to Apple.
SproutCore: rich web apps in JavaScript, no Flash needed - Ars T
Cappuccino Web Framework - Build Desktop Class Applications in O
...if you use Cappuccino, those apps will automatically look and behave like ... desktop apps - with zero learning curve on the developer's side. He or she can simply focus on building an kick ass app instead of trying to re-invent basic UI functionality every single time. I can see the allure of Objective-J / Cappuccino for building desktop-like Web applications. It gives you a very high level abstraction over the browser.