I just had to a share a bit of pride that I got checking out the latest release (1.1.11) of the Mission Planner. Look at all those vehicles APM now supports!!! To say nothing of all the hardware-in-the-loop simulations at the bottom left of that screen. And ArduRover, ArduBoat, and coming soon, ArduBlimp (successor to Blimpduino) and ArduTank (!).
I think we just need to add ArduSub and ArduRocket and we've got the entire world of vehicles covered. Not bad for $200 ;-)
This why we call APM the Universal Autopilot. As far as I know, this sort of one-autopilot-does-everything has never been accomplished before. So proud of the dev teams!