C4: open source multi-touch media authoring for iOS
C4 is a brand new creative-coding framework lets you build expressive user experiences and create works of art. C4 gives you the power of the native iOS programming environment with a simplified API that lets you get down to working with media right away. Build artworks, design interfaces, explore new possibilities of working with media and interaction.
C4 is the brainchild of Travis Kirton and a research project of his, Sebastian Boring, Dominikus Baur, Lindsay MacDonald and Sheelagh Carpendale at the University of Calgary.
read more and get started here: http://www.c4ios.com/
(as seen at TEI 2013 earlier this week)