A new prototype called Glimmer: a jQuery Interactive Design Tool is announced recently. 

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Glimmer is a WPF-based Windows application that allows you to easily create interactive elements on your web pages by harnessing the power of the jQuery library. Without having to hand-craft your JavaScript code, you can use Glimmer’s wizards to generate jQuery scripts for common interactive scenarios. Glimmer also has an advanced mode, providing a design surface for creating jQuery effects based on your existing HTML and CSS.