OpenAudible - OpenAudible Project Page
RoxyApps eBook Conversion Tool - Convert djvu, epub, fb2, lit, azw, lrf and other eBook files to txt, pdf, pdb, rtf and other formats
djvu-pdf.com - Converts PDF to DjVu and DjVu to PDF online.
TunesKit iBook Copy for Mac - Easily remove DRM protection from Apple iBooks and copy DRM protected iBooks to DRM free ePub files.
Epubor Ultimate - Designed for those people who want to read books more freely, without limitation.
DjVuLibre - DjVuLibre: Open Source DjVu library and viewer