A new version of Caliber has been released. Caliber is an open source e-Book management tool and is available for Windows, Linux and macOS. It can, among other things, look up all relevant information and chaff images, and convert e-books to make them suitable for the various types of e-readers. Furthermore, the program can convert newspapers, magazines and news articles into e-book format based on RSS feeds. Also with Caliber books can be purchased at the well-known web shops. The program is actively developed and usually a new version appears every other week on Friday. In version 3.22 the following improvements have been made:

New features
Edit book: Add a tool to upgrade books from EPUB 2 to EPUB 3 (Tools-> Upgrade book internals). Automatically upgrades metadata, converts the NCX table of contents and adds required manifest annotations
Add support for the FBZ format (zipped FB2). Closes tickets: 1762634
Kindle driver: Change the height of thumbnails to 500px, needed for the Oasis 2017
Edit book: When bulk renaming files are added in the book.
Polishing: Recognize title pages that are marked as covers in the EPUB 3 landmarks section
Edit Book: Automatically updated the modified timestamp in the OPF when saving EPUB 3 books.
Remove the ISBNDB metadata plugin as ISBNDB no longer allows free lookups. Closes tickets: 1761906
Bug fixes
EPUB 3 metadata: If the book defines more than one author
Check Book: Dont warn for nav document not in spine in EPUB 3 books
Linux installer: Fix umask not working with the recommended install command because stdin is a pipe
Browser viewer: Sync function without being logged in
When setting up a PDF file and the user clicks cancel, do not delete the existing cover
New news sources
Le Monde: subscriber paper edition by Remi Vanicat
Improved news sources
Globe & Mail
National Geographic
Slate
GoComics
Oregonian
Calibre 2.0 screenshot (810pix)

Version number 3.22
Release status Final
Operating systems Windows 7, Linux, macOS, Windows Vista, Windows 8, Windows 10
Website
Caliber
Download
https://calibre-ebook.com/download
License type GPL