APM Plane, APM Copter, and APM Rover Source are all software products developed by the same company, Autopilot. These products are designed to provide pilots with a more intuitive and efficient way to control their aircraft.

APM Plane is specifically designed for fixed-wing aircraft, while APM Copter and APM Rover Source are designed for rotary-wing aircraft. Each product offers different features and capabilities, such as autopilot mode, altitude hold, and obstacle avoidance.

Overall, these products aim to simplify the piloting process by providing advanced features that can help pilots achieve greater efficiency and safety in their flying.