RoxyApps eBook Conversion Tool - Convert djvu, epub, fb2, lit, azw, lrf and other eBook files to txt, pdf, pdb, rtf and other formats
TEBookConverter - Portable software for cloud, local, and portable USB drives
DjVuLibre - DjVuLibre: Open Source DjVu library and viewer
calibre - Ebook manager, viewer & converter
Epubor Ultimate - Designed for those people who want to read books more freely, without limitation.
Convertio - File Conversion in the Cloud