I'd recommend the 3DRobotics Iris: https://store.3drobotics.com/products/IRIS https://store.3drobotics.com/products/IRIS Runs the PX4 autopilot (which I believ

I'd recommend the 3DRobotics Iris: https://store.3drobotics.com/products/IRIS https://store.3drobotics.com/products/IRIS Runs the PX4 autopilot (which I believe is hackable), can be controlled by RC, has good support for camera, gimballs, attachments, etc. The Parrot firmware is closed and I don't know about other firmware implementations, but the protocol is open so you can write clients to control is - https://github.com/felixge/node-ar-drone https://github.com/felixge/node-ar-drone being one of the most well known.