dupd is a file duplicate detection CLI utility. The build currently supports Linux (tested on Debian), Solaris (tested on OpenIndiana), OpenBSD and Mac OS X. Other UNIX variants should work with minimal effort. dupd seeks to be fast and efficient. For most file sets it performs better than popular tools such as 'fdupes'.
jdupes - A greatly improved fork of fdupes duplicate scanner. Ported to Windows and Mac OS X with binary releases available.
FDUPES is a program for identifying or deleting duplicate files residing within specified directories.
Rdfind is a program that finds duplicate files. It is useful for compressing backup directories or just finding duplicate file ...