TouchDesigner: VideOSC App
VideOSC just might be my favorite OSC app I've come accross yet. Everyone with an Android who uses TouchDesigner really aught to check it out.
VideOSC uses your cell camera to create blocks of color information that is translated to OSC data so you can wirelessly stream it into Touch (or whatever program you use). Basically, you can turn RGB data into any kind of interaction you want. I hooked it up to the noise and color levels of a sphere using red and green channels. I can't wait to experiment with this one more.
It also is able to send the data from any sensor you have in your phone. It's by far the most versatile sensor based OSC app I've found. (I'm including the camera as a sensor).
Oh, did I forget to mention it's absolutely free?