From AX Systems:
Search of Similar Files (Ssf) is a powerful utility for searching of similar files on disks. Easy-to-use interface allows to narrow source and target groups of files for comparison from one file to several disks. You may use criteria of file similarity in any combination. Filters of inclusion and exclusion allow to considerably narrow the number of viewed files by their size and time of modification. While viewing found similar files you may set the display of relationship between them and also sort files by name, folder, size, or time of modification. The found similar files from target group can be selectively deleted or moved to the specified folder.