Calibre is a free and open-source e-book management software that allows users to manage their e-books, convert between different e-book formats, and sync e-books with various devices. It was first released in 2006 and has since become one of the most popular e-book management tools available.

One of the most notable features of Calibre is its ability to organize e-books into different categories and add tags, making it easy to search and locate specific books. It also allows users to edit the metadata of their e-books, including the title, author, and cover image, and can even download missing metadata from online sources.

Calibre also provides a powerful e-book conversion tool, allowing users to convert e-books from one format to another, such as from EPUB to MOBI, or from PDF to EPUB. This is particularly useful for those who want to read e-books on different devices that may not support the same file format.

In addition, Calibre supports a wide range of e-book readers, including Amazon Kindle, Barnes & Noble Nook, and Kobo e-readers, and can automatically sync e-books with these devices. It can also connect to online e-book stores, such as Amazon and Google Books, allowing users to browse and purchase e-books directly from within the software.

Calibre is an essential tool for anyone who reads and manages e-books. Its powerful features and easy-to-use interface make it a must-have for anyone looking to organize, convert, and sync their e-book library.

Key Features:

• Library management system to organize e-book collection
• Format conversion for compatibility with different devices
• Built-in editor to modify e-book metadata and table of contents
• E-book viewer with customization options
• Integrated web browser for downloading e-books
• Synchronization options for keeping e-book collection up-to-date across devices
• Extensible with plugins to add additional features and functionality.

• News download: Add a framework for scraping javascript heavy sites using a full WebKit browser. Used by the new recipe for time.com
• DOCX Input: Add a markup analyzer that identifies and removes redundant markup generated by Word. This can result in much cleaner HTML and reductions in markup size of up to 50%
• DOCX Input: Add support for theme fonts
• calibredb list: Add an option to limit the number of results
• Get Books: Allow stopping an in progress search. While doing a search, the Search button becomes a Stop button, and clicking on it stops the current search.
• When viewing the list of jobs in calibre, display the time at which the job was started.
• Conversion settings: When selecting the input/output profiles, show the profile screen size along with its description.

• Get Books: Fix searching using the title/author being case-sensitive and therefore sometimes not returning results if uppercase characters were used in the query.
• EPUB/AZW3 Output: When splitting HTML on page breaks, preserve tag structure in the split files. This fixes splitting losing some styling information for HTML files that define page breaks on deeply nested tags.
• DOCX Input: Fix some manual page breaks being ignored
• DOCX Input: Fix empty paragraphs not being rendered
• DOCX Input: Fix some text being underlined incorrectly. The 'none' underline style was being translated incorrectly.
• E-book viewer: When viewing EPUB files, ignore any encoding declarations in the HTML and assume that the HTML is encoded in UTF-8, unless decoding with UTF-8 fails. This is what the EPUB specification specifies.
• AZW3 Output: Fix a typo that could prevent conversion of some files
• calibredb list: When outputting data in columns, handle multibyte and east asian characters correctly.
• Get Books: Fix unable to change case of words in the title/author/keywords boxes because of completion.
• Fix unable to clear custom date columns using the bulk metadata edit dialog
• MOBI Output: Fix regression that breaks conversion of some documents