Mountie - Mount a second screen (iPad/iPhone/tablet) to your MacBook
Particlescape - Particlescape app lets you create stunning patterns at your fingertips.
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Luna Display - Hardware that turns the iPad into a wireless second display
Fluid dynamics - Fluid dynamics developed and published by Reinder Nijhoff.