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.

• Kobo driver: Support the new firmware version 3.0.0 for Kobo devices
• Content server: Show the name of the virtual library at the top when browsing books in a virtual library.
• Add a keyboard shortcut (Ctrl+*) to convert the current search into a temporary virtual library.
• Template language: Add a transliterate function, useful to convert metadata in other languages into its phonetic English representation, when exporting books from calibre.
• Remove the button to toggle search result highlighting from next to the search bar, as too many people click it accidentally and then do not realize what they have done, despite the confirmation message that pops up. The button can be restored via Preferences->Searching
• Wireless driver: Remove old non-streaming networking code. Apps that still use it must be updated. A message will popup notifying the user of the need to update if such an app is encountered.
• Linux: Add an option to cause calibre to detach from its controlling terminal (--detach)

• DOCX Input: Fix page-breaks created as a page break inside an otherwise empty paragraph not being rendered on conversion to PDF.
• Windows: When viewing books with an external viewer, check if windows will open the file with calibre itself, and if so, popup an error message telling the user to install some software capable of viewing the file.
• Wireless driver: Fix a bug that could cause the wrong path information to be sent to the device in some circumstances.
• Linux binary build: Return proper exit codes when raising SystemExit
• Transliterate the Arabic Alef into 'a'