calibre - Ebook manager, viewer & converter
RoxyApps eBook Conversion Tool - Convert djvu, epub, fb2, lit, azw, lrf and other eBook files to txt, pdf, pdb, rtf and other formats
Convertio - File Conversion in the Cloud
djvu-pdf.com - Converts PDF to DjVu and DjVu to PDF online.
CBconvert - A comic book converter with support for .cb*, .pdf, .xps, .epub, .mobi and directories.
Any eBook Converter - Any eBook Converter is a perfect DRM removal tool for removing DRM from eBook files and convert Kindle, Adobe, Nook, Kobo to DRM-free file, like epub, mobi, pdf, azw, txt and kfx.