I would characterize their main efforts as building a modular autopilot software & hardware infrastructure, for which the optical flow sensor is one part. They

I would characterize their main efforts as building a modular autopilot software & hardware infrastructure, for which the optical flow sensor is one part. They are both an academic research group & generous providers of an open source platform competitive with the best out there. Also check out Openpilot & Paparazzi--of which http://transition-robotics.com http://transition-robotics.com is a good current example.