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I like the iBooks App in Mac Os X, and the variety of books it allows you to read. I am in search for something similar for Ubuntu.
Your in luck, you can find Calibre Ebook library management in Ubuntu software center. It works like a charm.
It also handles a bunch of ebook-reader devices. It reads all (I think) book formats and can convert them too, if your reader does not support a given format.
How about fbreader ? It's an ebook reader with a built-in library manager
It does not come with a lot predefined libraries.
However, you can add your favorite OPDS library in there.
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