Last week in New York at Google’s annual design conference—formerly called Form but, after Google acquisition of Relative Wave’s Form, now called SPAN—I moderated a panel on the current state of design prototyping software. The panelists were: Andrew Debreczeni of Form; Andrew Pouliot of Facebook’s Origami; Clark Valberg of InVision; Daniel Hooper of Principle; and Paul Colton of Pixate (also now owned by Google). Google has generously made the video of all of SPAN’s panels, including this one, available on YouTube. I really enjoyed talking to these folks at the helm of some of the most interesting design tools today, and I think you will too.