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GitHub - caesiumstudio/csBooks-updates: csBooks is the best epub reader, pdf reader, mobi book reader and djvu reader for windows, linux and mac os. It solves your problems if you need ebook manager,
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GitHub - koreader/koreader: An ebook reader application supporting PDF, DjVu, EPUB, FB2 and many more formats, running on Cervantes, Kindle, Kobo, PocketBook and Android devices
GitHub - koodo-reader/koodo-reader: A modern ebook manager and reader with sync and backup capacities for Windows, macOS, Linux and Web
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