FBReader has built in Google Drive sync for the users files, allowing them to store their eBooks online, not taking up room on their local storage.

The software allows customizing things like fonts, direction, bookmarks, hyphenation, scrolling, scrolling options, colors, margins, etc.

FBReader features an inbuilt eBook store for users to download eBooks onto their devices through the app.

FBReader is a free application for Windows, OSX, Linux, iOS, and Android with source code available on GitHub.

FBReader, while offering many options is simple in design, with that allowing for fast use.