Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Universal Book Reader - Just like its name, Universal Book Reader is really a universal book reading application allowing you to read the eBooks from the convenience of your smartphones.
Haihaisoft PDF Reader - Haihaisoft PDF Reader is the name of a free to use PDF reader and printer that is extremely simple to launch.
Cool Reader - Fast and small cross-platform eBook reader for desktops and handheld devices
calibre - Ebook manager, viewer & converter
iReader - iReader is one of the most accomplished ways to read the books right from your smartphones.