If available, you can order the watch here: https://www.makerfabs.com/open-smartwatch.html (Rectangular case, but the PCB is the same.)

See Open-Smartwatch-OS for the source code on GitHub. The main branch should be stable, the develop branch is usually more up to date and can be unstable.

Media Coverage

Images

Pin out/Components.
The PCB. The TTGO Micro-32 module takes up most of the space on the PCB and adds to the thickness.
A simple watchface with step indicator.
The sandwich of the screen (GC9A01) and PCB.
PCB top view.
Arcting and night builds.
Green and black builds.
More colours.