We have been working on getting our next and big release of MockupTiger wireframe software. Brand new interface, entirely coded from scratch and all the widgets converted from HTML5 canvas to use SVG.
Here is a preview of whats coming..
D3 based visualization library used to produced prototyping Dashboard widgets
MockupTiger will become your most user friendly and easy to use Wireframing, mockup and semi prototyping tool.
In fact, it is the only wireframe app to let you build dashboard mockups with real data.