Calibre是一款电子图书管理软件，其提供的“一站式”的电子书解决方案，可以全面满足对电子书需求，甚至可以利用它组织成属于自己的电子图书馆，它的功能更是多种多样，不仅可以用它对图书进行格式转换，归类整理电子书，还可以将文本图像材料、在线内容（RSS）加入并转换为电子书。更重要的是Calibre是免费的、开源的，拥有跨平台的设计，可在Linux， OS X和Windows操作系统中运行，堪称电子书管理神器！
Calibre 2.44.1 Win & Mac + Portable | 265.05 MB
Calibre is designed to be an all-in-one open source tool for all of your e-books. It manages your e-book collection for you. It is designed around the concept of the logical book, i.e., a single entry in your library that may correspond to actual e-book files in several formats.
It can convert from a huge number of formats to a huge number of formats. It supports all the major e-book formats. The full list of formats can be found here.
The conversion engine has lots of powerful features. It can rescale all font sizes, ensuring the output e-book is readable no matter what font sizes the input document uses. It can automatically detect/create book structure, like chapters and Table of Contents. It can insert the book metadata into a "Book Jacket" at the start of the book.
Syncing to e-book reader devices
It has a modular device driver design that makes adding support for different e-reader devices easy. At the moment, it has support for a large number of devices, the complete list of which is here. Syncing supports updating metadata on the device from metadata in the library and creation of collections on the device based on the tags defined in the library. If a book has more than one format available, calibre automatically chooses the best format when uploading to the device. If none of the formats is suitable, calibre will automatically convert the e-book to a format suitable for the device before sending it.
Downloading news from the web and converting it into e-book form
It can automatically fetch news from websites or RSS feeds, format the news into a ebook and upload to a connected device. The e-books include the full versions of the articles, not just the summaries. calibre has over three hundred news sources and the news system is plugin based, allowing users to easily create and contribute new sources to calibre. As a result the collection of news sources keeps on growing!
Comprehensive e-book viewer
It has a built-in ebook viewer that can display all the major ebook formats. It has full support for Table of Contents, bookmarks, CSS, a reference mode, printing, searching, copying, customizing the rendering via a user style sheet, embedded fonts, etc.
Content server for online access to your book collection
Calibre has a built-in web server that allows you to access your ebook collection using a simple browser from any computer anywhere in the world. It can also email your books and downloaded news to you automatically. It has support for mobile devices, so you can browse your collection and download books from your smartphone, Kindle, etc.