3D Robotics develops the open source software that powers a lot of home brew UAVs. Today it's introducing a new tool to the public: DroneKit, software that allows anyone to create apps for, well, drones! DroneKit works with any craft that uses 3DR's "APM" autopilot (a small device you add to your 'copter), and apps can be created for Android, web and standalone "companion" devices (that you then connect to your quadcopter). What can you do with these apps? So far, mostly the same things you can do with existing flight planning software (like 3DR's own Tower app). That means controlling fly paths with waypoints, following GPS targets and access to all the telemetry of the drone. But, of course, now you can do it in new and creative ways. That's a good start, but its 3DRs promise to support the tool and keep adding new features that will change what we can do with these increasingly popular aerial craft.