FBReader (FBReaderJ) is a free ebook reader. Supports epub, rtf, doc (MS Word), html, fb2(.zip), mobi (including non-protected kindle books), and plain text file formats. PDF files are supported via FBReader PDF plugin. Since version 2.0 FBReader allows to synchronise book collection and/or reading positions with FBReader book network. Synchronisation is disabled by default, go to preferences dialog to enable it and configure parameter.