John the Ripper is a fast password cracker, currently available for many flavors of Unix (11 are officially supported, not counting different architectures), Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. Besides several crypt(3) password hash types most commonly found on various Unix flavors, supported out of the box are Kerberos AFS and Windows NT/2000/XP/2003 LM hashes, plus several more with contributed patches. John the Ripper is free and Open Source software, distributed primarily in source code form.
Here the link contains the downloads for Windows, Linux and Mac Operating Systems. Read the instructions before downloading them. For effective usage refer the Usage Guide.
Download: John the Ripper | JTR Unix Cracker
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