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.
I use Lithium on android. The dark mode is great for night reading.
Not open source but the app is ad free and has zero trackers.
I also use Lithium.