Calibre is an Ebook management software.

FBReader is a free ebook reader. Main ebook formats: ePub (including main features of ePub3), Kindle azw3 (mobipocket), fb2(.zip).

EPUB is an e-book file format with the extension .epub that can be downloaded and read on devices like smartphones, tablets, computers, or e-readers.

Amazon Kindle is a series of e-readers designed and marketed by Amazon.com.

iBooks is an e-book application by Apple Inc. for its iOS and macOS operating systems and devices.

NOOK is an ebook reading software.