App Starter. HTML5 UP! Responsive HTML5 and CSS3 Site Templates. GoodUI. Indigo Studio. January 9th, 2013 Indigo Studio, a new interaction design tool, has been released just over a month ago by the Infragistics team on both MAC and Windows.
The first version is completely free and there is no catch (future versions 2 and on will be paid). It has some interesting aspects to it: Storyboarding The tool itself is interesting in that it has two modes of working: screen and storyboard.