Natural User Interface (touchscreen)

Here's another player in the touch screen space called Natural User Interface. Sounds a lot like Surface and Perceptive Pixel. From their Website:

NUI is letting people “Touch the Future™” by delivering Innovative Multi-touch Solutions to a wide range of industries. Our client portfolio varies from global corporations to government organisations. Our products enrich the Interaction experience through it's innovative software and hardware solutions.

NUI is specialized in the revolutionary optical touch technology that supports single, dual and multi-touch.NUI's solutions can be used within a single user as well as multi-user collaborative environment.