A free ebook reader.

Opens and manages books stored on your device. Main ebook formats: ePub (including main features of ePub3), Kindle azw3 (a.k.a. mobi), fb2(.zip). Other supported formats: RTF, doc (MS Word), HTML, plain text.

DjVu books are supported via a free plugin.

For opening PDFs and comics, install a free plugin OR buy FBReader Premium. You pay once and have all the premium features forever.

The reading works in offline mode; the network connection is not required. When the device is online, you can access many ebook catalogs, where books are available for free and for a fee. Several popular English, French, Russian, and Polish libraries are included. Custom OPDS catalogs are supported, too. Alternatively, you can download books manually and save them on your device. 

FBReader can synchronize your library, bookmarks, and reading positions via the Book Network, a Google Drive™ based cloud service. The synchronization is disabled by default; to enable and configure it, use the preferences dialog.

The app is integrated with external dictionaries, including Dictan, ColorDict, Fora Dictionary, FreeDictionary.org, and LEO dictionary. The Premium edition includes built-in integration with Google Translate.

FBReader is fast and highly customizable. You can use external TrueType/OpenType fonts and custom backgrounds, the screen brightness can be adjusted while reading (slide your finger up/down along the left screen edge), and different day/night color schemes can be selected.

E-book reader. Multi-format, highly customizable. Supports cloud synchronization