Faced with the desire for a GPS-navigating fixed wing drone, I came upon PatrikE's fork of MultiWii 2.4. I forked it some more, to produce a version with SD card logging. The result is multiwii-2.4-fixedwing on github.
When I assembled my quadcopter, I always intended it to become a drone, that is to say, with autonomous features. The typical use case for the hobbyist is intelligent failsafe, specifically return-to-home or "RTH" capability. As I've assembled the parts to accomplish this, it's made me consider how to achieve the same thing for my plane.