ePub(also referred as EPUB or EPub) stands for Electronic Publishing and is a standard e-book format which is used by all popular e-book readers out there, including Barnes & Noble Nook, Sony Reader, iPhone/iPod Touch(using various e-book apps), and more. ePub files have .epub extension.

However, if you want to read ePub books on desktop, then you need to find some software to read it properly. In this article, I will introduce several free ePub reader software to accomplish this task.

Free ePub Reader-Firefox Add-on
EPUBReader is a Firefox add-on which lets you read ePub-files just in the browser. You don't need to install additional software! If you click on a link to an ePub-file, you are normally prompted by the Firefox "save as" dialog. With EPUBReader installed, the ePub-file is downloaded, processed and directly displayed ready to read. If your ePub file resides on your computer, drag and drop your file to Firefox, it will automatically open it. It runs on every operating system Firefox does (Windows, MacOS X, Linux).

Free ePub Reader- Adobe Digital Editions
Adobe Digital Editions is a popular free ebook reader software that allows users to read EPUB and PDF files, as well as Adobe Flash (SWF). The reading view consists of a navigation pane to view bookmarks, annotations, and a table of contents. You can hide the navigation menu and view the book in wide screen. There are four levels of font size with EPUB ebooks and four different display types for PDF files, double-page, single page, fit-to-width view, and custom fit view from 87-919%.

Free ePub Reader- MobiPocket Reader
MobiPocket Reader is not only an advanced ePub books reader but is also a great professional books organizer. You can import books in PDF, ePub, or Office formats and organize them quickly. Just double-click a book and start reading.