http://www.wired.com/wiredenterprise/2013/08/drone-autopilot/

World’s Smallest Drone Autopilot System Goes Open Source

The Lisa/S chip is 4 square-centimeters — about the same size as a Euro coin.
But this 1.9-gram sliver of silicon includes everything you need to autopilot an
aerial drone.

It’s the world’s smallest drone autopilot system — over 30 grams lighter than
its predecessor — according to the chip’s designers at the Delft University of
Technology in the Netherlands. And best of all, both the hardware and the
software is open source, meaning anyone can copy and use it — for free.

Thanks to Russ Brown