Calibre 7.12 is an open source e-book library management application

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Calibre 7 is an open source e-book library management application that enables you to manage your e-book collection, convert e-books between different formats, synchronize with popular e-book reader devices, and read your e-books with the included viewer.

Calibre 4.23 new features:

Kobo driver: Add support for new firmware. Also add recognition of ‘Kobo Plus’ subscription books

Edit book: Allow customizing the base background/foreground and link colors for the preview window. Closes tickets: 1889925

Quickview panel: Add actions to the context menu to search for book in library, open in viewer, etc. Closes tickets: 1891765

Allow forcing calibre to remember the column width for the On device column by right clicking the header of the column

Template language: Add functions to perform math operations to convert fractional numbers to integers

It acts as an e-library and also allows for format conversion, news feeds to e-book conversion, as well as e-book reader sync features and an integrated e-book viewer.

Calibre’s features include: library management; format conversion (all major ebook formats); syncing to e-book reader devices; fetching news from the Web and converting it into ebook form; viewing many different e-book formats, giving you access to your book collection over the internet using just a browser.
It has a cornucopia of features divided into the following main categories:

Library Management
E-book conversion
Syncing to e-book reader devices
Downloading news from the web and converting it into e-book form
Comprehensive e-book viewer
Content server for online access to your book collection

What’s New:

New features

Kobo driver: Add support for new firmware. Also add recognition of ‘Kobo Plus’ subscription books
Edit book: Allow customizing the base background/foreground and link colors for the preview window. Closes tickets: 1889925
Quickview panel: Add actions to the context menu to search for book in library, open in viewer, etc. Closes tickets: 1891765
Allow forcing calibre to remember the column width for the On device column by right clicking the header of the column
Template language: Add functions to perform math operations to convert fractional numbers to integers
Bug fixes

Content server: Fix Esc key not working in several views. Closes tickets: 1849958
Fix unable to delete default value for custom columns of boolean type, once set Closes tickets: 1889973
EPUB Output: When splitting dont consider files with only a single character empty
Comments editor: Fix syntax coloring for HTML view in dark mode
Book list: When a series column is not wide enough, elide text in the middle so that the series number is visible
New news sources

linuxnews.de and t3n.de by Volker Heggemann
Improved news sources

El Diplo
calibre Blog
ESPN
LA Times
Winnipeg Free Press
Popular Science
Science News Recent Issues