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.

New Features

• Allow creation of rules to convert arbitrary identifiers into clickable links in the book details panel (Prefrences->Look & Feel->Book details)
• Tag mapper: A new rule type 'split' allows you to easily split tags on a character
• Make the shutting down message an overlay so it is less disruptive
• Allow right clicking on Virtual Library tabs to edit/delete the virtual library.

  Closes tickets: 1568306

• Tag mapper: Add a button to edit the list of tags in a tag mapper rule using the tag editor dialog.

  Closes tickets: 1568376

Bug Fixes

• Conversion: Fix the obsolete HTML align=center markup (produced by Microsoft Word) not working for tables.

  Closes tickets: 1569583

• Font subsetting: When font-variant: small-caps is used include the capital letters as well, in case either the font or the renderer do not support OpenType smcp.

  Closes tickets: 1568555

• Font subsetting: Implement support for text-transform.

  Closes tickets: 1568555

• Fix the target book entry in the book list not being refreshed after merging books. Only matters if you have a column based on book formats.

  Closes tickets: 1568091

• E-book viewer: Fix a link that has some text along with a superscript/subscript being incorrectly detected as a footnote link
• Fix device detection on windows failing if the registry entries for the device contain a very long item.

  Closes tickets: 1567569

• Edit Book: Fix an extra colon being added when setting the 'notes' semantic
• Ensure that author folder names are never windows reserved names
• E-book viewer: When displaying an EPUB 3 document that uses epub:switch to provide a fallback for MathML content, prevent both the MathML and fallback from being shown together.
• PDF Output: When displaying an EPUB 3 document that uses epub:switch to provide a fallback for MathML content, prevent both the MathML and fallback from being rendered together.
• Fix exception in custom column preferences when the column lookup key is changed
• Catalog generation: Do not crash is a book in the library has no uuid.

  Closes tickets: 1565242

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