ArduCopter - Quadrotor Autonomous Control Theory and Implementation
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Skydroid SkyDroid - MX450 & T10 Combo - Ardupilot Training and Education Drone - Multirotor from 3DXR UK
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Arduino based Arducopter UAV, the open source multi-rotor - Arducopter, the open source UAV multicopter
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Archived:APM 2.5 and 2.6 Overview — Copter documentation