ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Okular - Okular is a universal document viewer based developed by KDE.
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.