FBReader is quite bare bones, but gets the job done. FBReader is available for Linux, Android, Mac, Windows, and Blackberry. To find out what ebook types are supported by FBReader, check out this file type matrix.
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Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website getjackd.net.