From Hardcoded Software:
dupeGuru is a tool which allows you find duplicate files on your PC. It can scan either file names or contents. The filename scan features a fuzzy matching algorithm that can find duplicate filenames even when they are not exactly the same. dupeGuru runs on Windows platforms. dupeGuru is efficient that it can find your duplicate files in minutes, thanks to its quick fuzzy matching algorithm. dupeGuru is customizable. You can tweak its matching engine to find exactly the kind of duplicates you want to find.
What's new in this version:
Version 3.7 improved delta values to support non-numerical values.