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I use a Kobo Libre 2 with Calibre Web to sync.
I have a Kobo Libre and with KoboCloud[1] it syncs automatically with Nextcloud and other cloud providers. It’s awesome.
There’s this company, which makes ebook readers that don’t seem to be tied to any particular vendor:
https://shop.boox.com/collections/all
They have so many models, though, that I have no idea where to start with them.