calibre - Ebook manager, viewer & converter
MobiLit by PaperLit - MobiLit is our full-stack DIY digital publishing software to create & distribute digital publication with a branded mobile app, engage readers and monetize.
FBReader - FBReader is an e-book reader for various platforms. Features:
Mag+ - Mag+ digitizes paper magazines and distributes it to apps across all mobile device platforms
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Tablet Publisher Pro - Convert PDFs and other print media into interactive digital publications delivered in native tablet based applications.