"Robota": Rabbit-powered custom autopilot. He did everything himself!
"UofA Robotics": Paparazzi-powered Twinstars
"Pine Tree": Doug Weibel and his ArduPilot IMU-powered Skyfun
"DIY Drones": The tried and true ArduPilot-powered EasyStar
"Donuts, Coffee and Muffins": Ben Levitt and his UAV DevBoard-powered AcroMaster (backup one!)
Adam Barrow and his UAVDevBoard-powered T28
Ryan Beall and his custom autopilot, Ateryx, in a Alpha Sport 450 (not competing)