FBReader is a free ebook reader. Main ebook formats: ePub (including main features of ePub3), Kindle azw3 (mobipocket), fb2(.zip). Developed by Geometer Plus
License: Open Source
iBooks offers a seamless experience within the Apple ecosystem with a robust built-in bookstore and user-friendly interface, making it ideal for Apple users. FBReader, on the other hand, excels in customization and format support, making it a versatile option for users who prefer a more tailored reading experience.