Calibre Portable is program to manage your e-book 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 eBook reader devices, fetching news from the Web and converting it into eBook form, viewing many different eBook formats, and giving you access to your book collection over the internet using just a browser.