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.

Version 1.26.0

New Features

• Edit Book: Allow direct importing of HTML or DOCX files as new books without doing a full conversion. Use File->Import HTML or DOCX to import a file as a new EPUB book with minimal changes from the original.
• Linux binary installer: Various improvements to the binary installer. It now creates an un-installer (calibre-uninstall) that will remove all files created by the installer. It also no longer asks for the installation directory. If you wish to change that, you need to specify it in the installation command itself. Also the installer is now downloaded securely via HTTPS from github and verifies the signature of the installed files. Finally, it can be used to create an isolated install, that only makes changes to files in the installation directory and does not require root privileges.
• Metadata download: Add an option to merge the downloaded comments into existing comments, instead of overwriting (Preferences->Metadata download).
• Edit book: Add an option to automatically beautify individual files whenever they are opened for editing. Look under 'Editor Settings' in the Edit Book Preferences.
• Bulk metadata download: When reviewing downloaded metadata allow hiding the controls on the comments box by right clicking in the comments area. Useful on smaller screens.
• E-book viewer: When displaying metadata for the book, also display custom column metadata

Bug Fixes