Code side of this project: http://bobparadiso.com/2015/06/16/eye-gaze-controlled-wheelchair-robotic-arm-and-ecu/
Runs on a particular Jazzy power wheelchair, Tobii EyeX, a DIY robotic arm, and RF/IR transmitters to control surrounding appliancs.
The eye gaze UI is in Unity3D and allows control of all these things. The computer sends the commands received from the eye tracker to an Arduino which controls everything.