[RodgerTheGreat]

How about the ZeroWriter Ink? https://www.crowdsupply.com/zerowriter/zerowriter-ink

The focus on the bundled firmware is word processing, but it's open-source and built around the popular ESP32 microcontroller family.

[kstrauser]

Wow, I love the looks of that. I have a Freewrite Alpha that's very similar at first glance, but it has a tiny LCD screen and isn't open source.

[multjoy]

And if you fancy making your own…

https://github.com/unkyulee/micro-journal