Open source pdf djvu xps cbz and tiff file viewer. Page scrolling is realized by screen touch (for more details see Menu/Settings/Tap Zones).

Application features:
* Outline navigation
* Bookmarks support
* Page navigation by screen taps + Tap Zones + Key binding
* Text selection
* Custom zoom
* Custom border crop
* Portrait/landscape orientation
* Support different navigation patterns inside page (left to right right to left)
* External Dictionaries support
* Built-in file manager with recently opened file view

Orion Viewer is free open source (GPL) project.
To donate this project you can buy Orion Viewer: Donation 1$ 3$ or 5$ package from market