What are some alternatives?
When comparing Duplicate Remover Free and Duplicate Cleaner, you can also consider the following products
VisiPics - VisiPics does more than just look for identical files, it goes beyond checksums to look for similar...
dupeGuru - dupeGuru is a tool for finding duplicate files on your computer.
Easy Duplicate Finder - Free download! Find and delete duplicate files with Easy Duplicate Finder™. Get rid of annoying duplicates on your Windows and Mac.
FSlint - FSlint is a utility to find and clean various forms of lint on a filesystem. I.E.
MacPaw Gemini 2 - The intelligent duplicate file finder
AllDup - AllDup is a freeware tool for searching and removing file duplicates on your Windows computer.