Maqetta
Visual authoring of HTML5 user interfaces - in the browser!
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Hunter's comment
Its an open source project through which developers can visualize their HTML5 User interfaces directly in their browsers.
Maqetta is an open source project that provides WYSIWYG visual authoring of HTML5 user interfaces. The Maqetta application itself is authored in HTML, and therefore runs in the browser without requiring additional plugins or downloads.
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