I personally use Zathura, it's minimalistic and uses VIM bindings.
But if you want something feature-dense, with a way of organising your library, eReader integration, file converting and more, Calibre is pretty amazing (and the actual reader part of Calibre is quite nice to use in my opinion).
Huh ok, I’ll have to give zathura a peek. Sounds interesting
Yeah I love calibre. I use it to manage my main library on my server, in addition to calibre-web for managing my front end. It’s really good at managing a ton of ebooks
KOReader, though most people will probably find the UI off-putting at first.
Thing is, it's perfect for use on an e-ink device, which is what's it's primarily designed for. The desktop (Linux and Mac) and Android versions are just icing on the cake, and they all work the same and can sync reading activity between them. Tons of features, options for tweaking book layouts, plugins for integration with other services, some integration with Calibre, etc. It takes the "kitchen sink" approach and I love it. I've found spending the time to learn it to be really rewarding.
I don't own a Kindle device so I don't have firsthand experience, but I do know that for that platform your device will have to be jailbroken. Aside from that, these are the instructions!
For Android, the ReadEra app, because it's the only darn ebook app I could find that allows a scrolling mode instead of page flip. And you can add the Twilight app also to change screen temp, and extra dim mode in the dark. It works really well.
For e-ink ereaders, I don't know what the best one is right now. Definitely not Kindle though. And Kobo has overdrive library integration. But e-ink in general is very nice for reading. Definitely go for 8 inches or more in screen size though if you want to read manga. Also physical page turn buttons are really nice.
I use BookFusion. It’s a paid service but syncs the library and progress across platforms. Integrated with Calibre too, which I saw you mentioned you use in a different comment. Works great for me, but good luck finding something that works for you.
Ok that’s super interesting. That is much cleaner than my current way of downloading my books to my iPad, so I’ll have to check that out and see how easy it is to integrate
Oh,I think you’re right. They have their Calibre plug-in which is open source I think but I think in my head I conflated that with the whole app. My bad.
I recently removed my PDF reader and use Firefox to read PDFs. For that, I created a new Firefox user account, set it up accordingly (with a few dedicated addons, plus making manual CSS changes to the user interface). Then I created a script (in Linux) to run a file or url with this user account instead, associated the script as the default application for the .pdf file format.
To create a new profile, you can run Firefox with the commandline option firefox --ProfileManager. The rest is pretty much self explanatory in my opinion.
I hate to say it because I am a Cinnamon/Gnome/GTK guy, but I think Okular may be the best Linux reader. I think it can do form filling too.
For normal use I use Firefox, but if I needed something different Okular is one place I would look pretty quickly. I have used it in the past for more tricky things. Well I'd probably look evince and be disappointed first, then move on to Okular.