What's hot: Online, publicly-accessible, scanned-in library archives.
What's not: Pinhole viewers which wad a really shitty UI/UX between the reader and the actual fucking text.
IA's BookReader is actually one of the best reading software available, online or off. Just fucking _use_ it already.
No, I don't want to be looking at your shitty webpage when I'm trying to read a document I WANT TO READ THE FUCKING DOCUMENT.
Generalistic and moderated instance.