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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.
@fanoush
There is e.g. DK08 and SMA-Q2, both ~$30 on aliexpress, both hackable in a sense that you can upload your firmware (e.g. Espruino) without taking device apart. For Q2 see also https://hackaday.com/2020/01/30/sma-q2-smart-watch-is-completely-hackable/ As for DK08, I have one that I bricked, second that I gave to someone and waiting for third to arrive.
However those are otherwise quite limited when compared to bangle, no gps, compass, no touch screen, dk08 has just one touch button and that's all.
EDIT: also there is another strange one called CV16 (see e.g. here ) that should be hackable too (DaFit type firmware like P8) but figuring out how to update both displays could be a bit tricky.