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What Amazon Kindle? Here's an Open Source eBook Reader
(itsfoss.com)
This is a most excellent place for technology news and articles.
I wasn't impressed with the Kobo, although it does the job. I'm not familiar with the Boox. I will have to look that one up.
What sets some of Boox's models apart from the other e-readers is they're full Android devices; you can install most apps from the Play Store. Perhaps not as great for battery life, but a world apart so far as functionality goes (and you can even install the other e-book vendors' apps if you have existing purchased content).
In the "pocketable" size category, Palma which is a phone form-factor device (I have one of these, has been great), the Page looks very much inspired by the design of the Kindle Oasis, or the Tab Mini C has a colour e-ink display.