DronePro allows MAVLink control of drones including the 3DR Iris, Iris+ and Y6 via USB OTG with video preview from a WiFi connected GoPro Hero3+ or USB UVC video capture.
Newly added for DJI Phantom 3 Professional and Vision 2+ with GroundControl waypoints.
USB / Bluetooth Gamepads can be used to control the drone via an RC override option.
Cardboard VR / AR goggle output switches the video in a 3D stereo mode with head tracking controlling the gimbal and yaw.