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The default is AdobeViewer, which is what I use. The other option out of the box is fbreader. You can also install Coolreader yourself, and then set up the default epub app in the /system/config/extensions.cfg file (plenty of other threads describing that). If you do a long press on a book in the Library app, you'll see an "Open with" menu item that allows you to choose which reading app you use for each book.
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