Calibre is an e-book library management application, viewer and editor. It's also commonly used for e-book file format conversion and syncing to reader devices. Calibre also simplifies downloading news from the web and converting them into e-book form, and can act as content server for online access to your book collection.
Kavita is a full-fledged, fast, cross-platform, & open-source manga, comic, and book server. Built from the ground up with a focus on manga and a goal of being a full solution to your reading needs. Set up your own server and share your manga, comics, and e-book collection with your friends and family. Extensive File support Manga/Comics: ZIP, RAR, RAR5, CBR, CBZ, CB7, CBT, TAR.GZ, 7ZIP/7Z Books: EPUB2, EPUB3, PDF Raw Images: JPG/JPEG, PNG, WEBP, GIF, AVIF Manga/Comic Reader Image Scaling to fit