FBReader is a free e-book reader that allows you to open and manage books stored on your device (cell phone, PC, laptop or tablet).
Compatibility
Platforms
Available on platforms/operating systems: Android, Huawei, iOS, Windows, Mac, Linux (Snap) and Chrome OS.
Supported eBook formats
ePub, FB2, FB2.ZIP, AZW3, MOBI, TXT, HTML, DOC, RTF, PDF, DjVu (supported via a free plugin), CBZ, and CBR.
Free and paid versions
FBReader for Windows/Mac/Linux is free. For Android and iOS, there are free and paid versions. The free versions have some platform-dependent limitations. The paid version on Android is a separate app called FBReader Premium. On iOS, FBReader can be upgraded to the full version via in-app purchase.