To turn pages swipe screen horizontally or use hardware volume keys.
Preferences Dialog allows you to customize OpenBook to suit your taste: colors, fonts, various directories, page turning options, etc. Shake to switch day/night mode.
OpenBook's Menu allows you to navigate through libraries and to control the application. If your device has no hardware Menu button, touch bottom-center part of the screen to run menu.
OpenBook is a branch of FBReader, but smaller and add some new features (such as shake and search), also free and open source.
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