switching.social#Calibre is a free open source eBook manager. You can use it to organise your eBook collection, edit eBooks and convert eBooks from one format to another:
It's available for Windows, Mac and Linux.
For advanced users, there's also a wide range of plugins which add extra features:
https://www.mobileread.com/forums/showthread.php?s=1ed4bbb80fc6911d4132b605afc2a3e1&t=118764
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