https://github.com/CSAILVision/GazeCapture
https://github.com/pupil-labs/pupil
https://github.com/coxlab/eyetracker
https://github.com/esdalmaijer/webcam-eyetracker
https://github.com/stepacool/Eye-Tracker
https://github.com/antoinelame/GazeTracking
https://github.com/LukeAllen/optimeyes
https://github.com/brownhci/WebGazer
To improve with: