There are a few documentaries out about a company founded by Apple in the 90’s called General Magic. (the one I recently watched was on Showtime) It is very interesting to see how and why it ended up shutting down and then see where all the employees went and what they accomplished afterward.
The product they developed was the precursor to the smart phones we know and love today. They were way ahead of their time.
It is was an OS called Magic Cap.
Thanks to Adafruit, you can now run and enjoy that software with a little elbow grease.