There's also http://www.ohwr.org/projects/f-watch/wiki http://www.ohwr.org/projects/f-watch/wiki, a smart watch made by a team at CERN for a retiring researcher

There's also http://www.ohwr.org/projects/f-watch/wiki http://www.ohwr.org/projects/f-watch/wiki, a smart watch made by a team at CERN for a retiring researcher. It's powered by a very low-power EFM32/ARM microcontroller, uses a metallic e-ink display, the board is designed with KiKad, and has all the resources they used on the website.