Below you will find a short list of eBook readers for Windows, Mac OS X, Linux, iOS, Android, and more. 

• Stanza iOS (iPhone/iTouch/iPad)�Stanza is a free application for your iPhone, iPad, and iPod Touch. Use it to download from a vast selection of over 100,000 books and periodicals, and read them right on your phone. It�s a wireless electronic library that stays open 24/7.
• Stanza Desktop from Lexcycle. Stanza comes in a number of editions; to read ePub on your desktop computer or laptop, you want what is called �Stanza Desktop.� Download the software, install it, and then it will let you read the ePub ebooks. Desktop version is free and in beta..(For�Windows�and�Mac OS�computers)
• Adobe Digital Editions. Adobe Digital Editions (ADE) is an ebook reader, and an ebook library manager. (For Windows and Mac OS computers.)
• Calibre. Calibre is an open source ebook reader, and ebook library manager, that can read ePub files. It works with Windows, Linux, and Mac OS X.
• FB Reader/FBReaderJ. This is a free ePub reader for Linux, and Windows XP, Vista, Seven, Android, Archos PMA430, Motorola a1200, PepperPad, Siemens Simpad, Sharp Zaurus, and Nokia Maemo.
• Aldiko book reader.�Aldiko works with a wide range of publishers, booksellers, device manufacturers and carriers around the world. Collaboration allows us to bring the broadest selection of global content and the best user experience to users. It also allows us to make the Aldiko Book Reader easily accessible to users worldwide.
• Barnes & Noble Nook. The Barnes & Noble Nook is a hardware eBook reader availabile in both e-Ink and Color LCD versions with support for ePub ebooks, as well as other formats. It brings with it the backing of Barne & Noble's eBook Catalog and great in stor features only available to NOOK owners.
• Nook for Android, iOS, PC and BlackBerry. Nook apps are eBook reader apps for various platforms that let you purchase and enjoy books from the Barnes and Noble catalog, as well as share them anongst friends (lending) and importing books from other sources.
• iPhone BookShelf.�BookShelf is an easy to use electronic book reader for the iPhone, iPad, and iPod Touch. Available through the AppStore, BookShelf installs easily on your mobile device.�BookShelf lets you read any text or HTML file, older Palm OS reader files, and ePub books. Many file types can be downloaded from websites directly to your iPhone. You can even download any web page and read it later without needing an Internet connection.