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Rover is an advanced open source autopilot for guiding ground vehicles and boats. It can run fully autonomous missions that are defined using mission planning software or pre-recorded by the driver during a manual run.
This is the platform that won the 2013 and 2014 Sparkfun Autonomous Vehicle Competition! That said, Rover is far more than just a toy - it is already being used in numerous applications (you can see a few examples including agricultural automation in our Video Demos).