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Visual Center - A tool that will find the visual center of your image
calibre - Ebook manager, viewer & converter
FBReader - FBReader is an e-book reader for various platforms. Features:
Create - CREATE is a powerful and intuitive mobile creativity tool.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Tablo Publishing - The Best Way to Publish a Book.