Okular - Okular is a universal document viewer based developed by KDE.
Online Convert - Convert files like images, video, documents, audio and more to other formats with this free and fast online converter.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
Zamzar - Free conversion online of many type of documents (images, text, video, audio...
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
online2pdf - This Online PDF Converter can convert all your files to PDF but also compress and merge PDF files! Word, Excel, PowerPoint, images and any other kind of document can be easily converted to PDF on Online2PDF.