MaxComm is a free customizable controller for sending OSC messages to another computer over a Wifi network.
The app incorporates an interface builder, which allows the user to add sliders, buttons, and toggles. Interfaces can be saved, loaded, and exported as max patches for use in Max/MSP.
MaxComm allows users to send motion data (using the devices built-in accelerometer and gyroscope) as well as multitouch data.
MaxComm was designed for use with Max/MSP, but should be able to function with any program capable of receiving OSC messages via a UDP connection.