The DJI Flame Wheel F450 is an affordable quadcopter that is designed for entertainment, aerial photography, and FPV flying.
The vehicle is available as an “almost ready to fly” kit from DJI and other vendors. It is intended to be used with an autopilot, and can readily be fitted with a PX4-compatible flight controller.
The build shown here includes the Pixhawk 3 Pro flight controller, a distance sensor and a very accurate RTK GPS position sensor (providing centimetre-level location resolution).
The source code of PX4 Flight Stack and Middleware are licensed under a permissive 3-clause BSD. For details see this licensing page.