Prototype\wireframe\mockup tool for iOS?

Question

iOS

Please advise a desktop tool for prototyping \ creating mockups \ wireframes for iPhone \ iPad applications. Thank you.

Answer 1

On Windows: Axure
and its libraries
www.kreativr.de/ipad-axure-widget-library/
www.paulsizemore.com/axure-iphone-widgets-and-library
axureland.com/axure_widget_libraries/entry/touch_gesture_axure_widget_library

Answer 2

There is a good open source project for these tasks - giveabrief.com/