calibre screenshots

Manage your e-book collection, edit them, and convert e-books between formats
calibre 4.8 : E-Book Editor

Alternative downloads

Epub Reader for Windows
Simple utility to read EPUB e-books with some conversion capabilities.
Ultra eBook Reader
Program for reading books in digital formats.
Epubor Kindle Transfer
Straightforward app to transfer e-books from your PC to your Kindle or Kobo.