dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
Rdfind - Rdfind is a program that finds duplicate files.
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
FSlint - FSlint is a utility to find and clean various forms of lint on a filesystem. I.E.
XYplorer - File Manager for Windows