PDF24 PDF Creator - Create PDF and convert documents to PDF for free with the free PDF24 PDF Creator.
RoxyApps eBook Conversion Tool - Convert djvu, epub, fb2, lit, azw, lrf and other eBook files to txt, pdf, pdb, rtf and other formats
PDFCreator - PDFCreator converts every printable document to PDF and many other formats. Create professional PDFs with a few clicks and it's free. With many Professional Features: merge documents, send emails and more.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
doPDF - Multi-language. doPDF is the ONLY free pdf maker whose interface is currently available in 33 different languages and has a website translated in 30 languages (and growing, thanks to our translators).
DjVuLibre - DjVuLibre: Open Source DjVu library and viewer