RoxyApps eBook Conversion Tool - Convert djvu, epub, fb2, lit, azw, lrf and other eBook files to txt, pdf, pdb, rtf and other formats
calibre - Ebook manager, viewer & converter
DjVuLibre - DjVuLibre: Open Source DjVu library and viewer
Convertio - File Conversion in the Cloud
Epubor Ultimate - Designed for those people who want to read books more freely, without limitation.
CBconvert - A comic book converter with support for .cb*, .pdf, .xps, .epub, .mobi and directories.