Advice an eBook reader for Gnome

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http://unix.stackexchange.com – There are eBook readers for Android, there's Okular for KDE, and stuff like that, but what I want, is an eBook (ePub format) reader for my normal Linux desktop. I know there's Calibre, which goes way beyond being just an eBook reader, and theres FBReader, Which doesn't really work as of yet. Given that eBooks have been around for several years now, I'd assume, more software would've sprung up by now. (HowTos)