Calibre is a free eBook library management application for the Mac with a built-in eBook reader. This programs supports most eBook file formats so that eBooks purchased for a variety of devices will be compatible. Calibre also has the ability to sync your library with most major devices including Kindle, Nook, iPad, and Android devices.
Calibre has the following features:
Syncing to e-book reader devices
Downloading news from the web and converting it into e-book form
Comprehensive e-book viewer
Content server for online access to your book collection
Changelog for version 0.8.69:
E-book viewer: Add a button to the toolbar to switch themes easily
When downloading metadata for many books, if some of them fail, add an option to the downloaded message to show the failed books in the main book list, so that they can be individually processed easily
Remember last used window size of the conversion dialogs.