GUI toolkit that actually looks like it's been designed to work well on a touchscreen. Button and sliders are tangible. Only rotating elements are incredibly large and easy to manipulate. A lot here to like.
Controlled - GUi - Graphical User Interface
Pure90 - Retina Digital Audio Workstation GUI Kit
Laundry Master App - iOS by Zahir Ramos
Discovr Music for iOS - Screencast
Discovr Apps for iOS - Screencast
Tweetbot - a Twitter client
Pounce: 1-Tap shopping app