Open Source software for Quadcopters
my question is general so please bear with me. I'm now interested in buying a quadcopter and develop some functions that it does for example an android app to control it, or objects detection. So my question is what are the available quadcopters which has a software that allows me to do such things not just a flying toy?
P.S: I'm asked to buy a kit within 600$ and not build it by myself