Technically the ground control software is a separate open source project, also the px4 project is looking to release a open hardware esc (electronic speed cont

Technically the ground control software is a separate open source project, also the px4 project is looking to release a open hardware esc (electronic speed controller) soon as well (https://pixhawk.org/modules/pixhawk_esc https://pixhawk.org/modules/pixhawk_esc). Agreed though, the magic is in the total sum.