“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.
Maqetta allows User Experience Designers (UXD) to perform
drag/drop assembly of live UI mockups. One of Maqetta’s key design
goals is to create developer-ready UI mockups that promote
efficient hand-off from designers to developers.