Calibre is a program to manage your eBook collection. It acts as an e-library and also allows for format conversion, news feeds to eBook conversion, as well as e-book reader sync features and an integrated e-book viewer. It features library management, format conversion (all major eBook formats), syncing to e-book reader devices, fetching news from the Web and converting it into eBook form, viewing many different e-book formats, and giving you access to your book collection over the internet using just a browser.