I'm looking for recommendations. I usually use Overdrive with books I've downloaded (I think in the epub format). But now I hear that Overdrive is no longer being supported (I think the company wants people to use their Libby app instead). I'm hoping to find something open source and privacy minded. Also not wild about what Overdrive is doing to public libraries
I use Moon+ Reader. It's not open source but it's so snappy; page changes are instant and scrolling is flawless. It connects to my calibre server too. Android only I think.