PX4 autopilot

The PX4 autopilot is an open-source system for autonomous aircraft. The project was started in 2009.

Overview

PX4 supports the following features:

Multiple vehicle types, including fixed-wing aircraft, multicopters, helicopters, rovers, boats and underwater vehicles
Fully manual, partially assisted and fully autonomous flight modes
Integration with position, speed, altitude and rotation sensors
Automatic triggering of cameras or external actuators

PX4 is capable of integrating with other autopilot software, such as the QGroundControl ground control station software, via the MAVLink protocol.
PX4 is open-source and available under a BSD-3-Clause license.