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Koodo Reader: open-source ebook reader (Free app)
Koodo Reader is a modern ebook manager and reader with sync and backup capacities for Windows, macOS, Linux and Web Features * Format support: * EPUB (.epub) * Scanned document (.pdf, .djvu) * DRM-free Mobipocket (.mobi) and Kindle (.azw3, .azw) * Plain text (.txt) * FictionBook (.fb2) * Comic book archive (.cbr, .cbz, .cbt, .cb7) * Rich text