Jacques Bitoniau built a custom control system for his quadcopter that replaces a conventional RC transmitter/receiver and features the ability to switch between two different operators for training purposes. In his system, the operator moves a joystick and a WiFi-equipped PC sends commands to a Raspberry Pi, which communicates with one of our Maestros to produce signals for a flight controller.
Jacques also wrote a C++ library for Windows, Linux, and Mac to control the Maestro using its serial interface. (You can now find this as a Recommended Link on our Maestro product pages.)
You can read more about Jacques’s control system in his forum post.
Featured link: http://forum.pololu.com/viewtopic.php?f=2&t=7351