Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
XYplorer - File Manager for Windows
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.
FreeCommander - FreeCommander is an easy-to-use alternative to the standard windows file manager. The program helps you with daily work in Windows. Here you can find all the necessary functions to manage your data stock.
Czkawka - Multi functional app to find duplicates, empty folders, similar images etc.