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.
hg clone https://bitbucket.org/sdottaka/winimergebuild
cd winimergebuild\winimerge
buildbin.cmd
GPL2