Altarsoft PDF Reader - Altarsoft PDF Reader is a simple to use PDF files management program that allows its users to view PDF files, encrypt the files and even annotate these files as well.
calibre - Ebook manager, viewer & converter
eXPert PDF Reader - eXPert PDF Reader is a free to use PDF reader and views for the Windows operating systems.
Icecream Ebook Reader - Ebook Reader by Icecream Apps allows to read ebooks in several formats (EPUB, MOBI, FB2 and others). Download EPUB Reader for Windows.
Cool PDF Reader - Just like its name Cool PDF Reader, this small PDF reader is a really a cool PDF reader for viewing, reading and editing PDF files for free.
Adobe Digital Editions - ebook reader software