Website: https://calibre-ebook.com/
Source Code: https://github.com/kovidgoyal/calibre
Donate: https://github.com/sponsors/kovidgoyal, https://patreon.com/kovidgoyal, https://liberapay.com/kovidgoyal, https://calibre-ebook.com/donate
ΒΆ Description
"calibre is an e-book manager. It can view, convert, edit and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and macOS."