Calibre is great for managing an ebook library, and okay for reading ebooks but the reader is clearly not its primary focus, so I'm wondering what readers folks here use across platforms.
I know of a few, but I'm always on the lookout for different options that may have features I didn't realize I'd love to use.
Librera is the one I’d recommend if you care about customisation, and it also has TTS (Text To Speech), which is why I use it almost exclusively.
Myne is a beautiful and minimalistic app that lets you read books from the Gutenberg project. I have asked the developer, and they have no intention to add TTS functionality to the app.
Shosetsu is the best app for fanfiction (AO3 extension) and lightnovels. It recently got a TTS feature as well, but that feature is not very usable in its current implementation.