FBReader is an application that allows users to open and read ebooks that are DRM-free or protected with Readium LCP. It supports a variety of ebook formats, including ePub, PDF, Kindle azw3, and fb2(.zip), as well as comic books, RTF, doc, HTML, and plain text. This makes it a versatile option for readers who may have ebooks in different formats.
One of the helpful features of FBReader is its dictionary integration, which allows users to easily look up words or phrases while reading. It also offers a wide selection of external dictionaries to choose from, making it useful for readers in foreign languages.
For those who like to keep their reading synced across devices, FBReader offers the option to sync your library and reading positions with the FBReader book network, which is a cloud service based on Google Drive™. This feature is off by default, but can be enabled and configured through the preferences dialogue.
FBReader is known for its speed and high level of customization. Users can use external TrueType/OpenType fonts and custom backgrounds, adjust screen brightness while reading, and choose from different day/night color schemes. It also includes a browser/downloader for accessing ebook catalogs and stores, and supports custom OPDS catalogs.
In addition to its functionality, FBReader is also user-friendly with localization for 34 languages and hyphenation patterns for 24 languages. This makes it accessible to a wide range of readers around the world. Users also have the option to manually download books and save them on their device in the designated "Books" folder. Overall, FBReader is a comprehensive and customizable ebook reader that caters to the needs of a diverse audience.