WEB UI

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ICONS

CSS

http://code.google.com/p/smartgwt/ Smart GWT is a GWT-based framework that allows you to not only utilize its comprehensive widget library for your application UI, but also tie these widgets in with your server-side for data management.

Smart GWT

http://www.sencha.com/products/extjs

ExtJS

Sencha Ext JS Overview
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ThemeRoller

http://jqueryui.com/themeroller/