This has to be the most important part of building a drone and running a business. Ok you can go out and spend 20 thousand dollars and get into business but what about the learning. It’s an American bad habit, See a trend, think it’s a simple solution to get involved, so you drop a bunch of money at it.…
https://www.opendronemap.org/
https://www.librepilot.org/site/index.html
https://www.dronecode.org
https://ardupilot.org
https://ardupilot.org/planner/index.html#home