"Posture! Posture! Posture!" is a Chrome extension analyzes your sitting position and blurs your browser as you start to hunch. It studies your posture to set a baseline of where it thinks your neutral position should be, and then the more you hunch, the more it blurs. It's a great way to train yourself to sit properly throughout the day.
Built with React and powered by Tensorflow, this handy extension is available on the Chrome webstore, and the code is completely open source.