I just tend to use non-Kindle applications/devices for this. It's always been extremely easy to get non-DRM ebooks into Apple's book reading app (formerly iBook

I just tend to use non-Kindle applications/devices for this. It's always been extremely easy to get non-DRM ebooks into Apple's book reading app (formerly iBooks, now just Books, in Apple's ongoing quest to make most of their application names as boring as possible). Perhaps ironically this makes Books the "non-walled-garden" app for me. The pitfall in all this, though, is that there are a lot of commercial books that are only available from publishers that use DRM, and personally I don't consider DRM a sufficient justification for piracy -- so that leaves me stuck with locked books regardless. Lately I've been buying them from Apple rather than Amazon, although if I actually jump through whatever hoops are required to set up DRM stripping with Calibre for Kindle books, assuming that's still possible, I may switch back.