WinIMerge is a simple image diff/merge tool like WinMerge.
This software uses the FreeImage open source image library.
See http://freeimage.sourceforge.net for details.
FreeImage is used under the the GNU GPL version.
git clone https://github.com/winmerge/winimerge
git clone https://github.com/winmerge/freeimage
cd winimerge
buildbin.vs2019.cmd
GPL2