Wikipedia
XnView is an image organizer and general-purpose file manager used for viewing, converting, organizing and editing raster images, as well as general purpose file management. It comes with built-in hex inspection, batch renaming and screen capture tools. It is licensed as freeware for private, educational and non-profit uses. For other uses, it is licensed as commercial software.
It is now available for Windows, Windows Mobile and Pocket PC but was previously available for Unix-like systems as well. An extended version of XnView, called XnViewMP, is available for Windows, OS X and Linux.
XnView has received five cows from Tucows. In 2006 Sveriges Television (SVT) recommended XnView in their High Definition Multi Format Test Set. Research papers about DICOM and digital watermarking used XnView for image processing.