Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.