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.

• DOCX Input: Support linked (as opposed to embedded) images, if the linked image is found on the local computer.
• FB2 Input: Add support for note and cite back references. Link pairs of type="note" and type="cite" now automatically generate the correct back reference.
• When automerging books during during an add, include the author as well as the title in the report of merged books.
• OS X Mavericks (10.9) breaks connecting to iTunes and iBooks on iOS devices. For more details see: http://www.mobileread.com/forums/showthread.php?t=215624

• OS X: Fix system tray notifications causing crashes on some OS X 10.9 (Mavericks) systems (those that had Growl installed at some point).
• OSX: Fix font size in completion popups too small on Mavericks (I hope)
• PDF Output: Fix rendering of some semi-transparent images. All semi-transparent images are now rendered using soft masks.
• MOBI Output: Fix text marked with white-space:pre-wrap causing the Kindle to break lines at arbitrary points inside words.
• FB2 Input: Fix a regression that broke conversion of FB2 files with paragraphs having both a style and an id attribute.
• TXT Input: Ensure that
• Book details panel: Fix HTML in author names and identifiers not being escaped
• HTML 5 parsing: Fix handling of xml:lang attributes on all elements xml:lang is now mapped to a plain lang on all elements, not just
• Update HTML 5 parser used in calibre (html5lib-python) to fix a few corner cases
• When bulk deleting formats, use a single temporary directory for the deleted files. This makes restoring them from the recycle bin a little cleaner. Also might fix the reported issue with the windows recycle bin choking on creating a large number of folders.
• DOCX Input: Add support for hyperlink fields that have only anchors and not URLs
• DOCX Input: Fix handling of multiple block level bookmarks at the same location.
• HTMLZ Output: Fix Htmlz does not apply inline css from .
• Fix the restore database operation failing on windows installs with long usernames (this would cause the path to the temporary folder used to restore the database to become too long).
• ODT Input: Various workarounds for broken ODT files generated my mk4ht
• Fix a bug with non-ascii text in the create catalog dialog