Kobo's devices let you bypass the account signup via a single option in a config file. Whether you do so or not it's easy to install koreader and start writing plugins for it. You can also hack on the linux OS they use
replyYep, there's a plethora of tweaks and stuff out there to mess with Kobos to make them your own, and it's not hard to do.
replyBeen super happy with my Kobo Clara.
You can also sync to your own library - eg calibreweb.
replyIt’s not too disgusting, and over-the-air is nice to have.
There are Android e-Readers, like Boox, but that does not imply it is easy to do fun stuff. Seems pretty locked down.
I have a PocketBook myself, no complaints there and you can install software (at least I can on the one I have but it is a few years old now) and thus never had the need to hack the thing.
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