Well then you can try stuff mentioned in jeffmer's post #9 and see what is missing for you. It is still usable, just a bit older. Also there is stuff done by enaon https://github.com/enaon/eucWatch https://enaon.github.io/eucWatch/
It also uses Espruino and the app loader but apps and the UI is different.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
Well then you can try stuff mentioned in jeffmer's post #9 and see what is missing for you. It is still usable, just a bit older. Also there is stuff done by enaon
https://github.com/enaon/eucWatch
https://enaon.github.io/eucWatch/
It also uses Espruino and the app loader but apps and the UI is different.