John the Ripper is described as 'Fast password cracker, currently available for many flavors of Unix, 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 systems, supported' and is an app in the security & privacy category. There are more than 10 alternatives to John the Ripper for Windows, Linux, Mac and BSD. The best John the Ripper alternative is Kon-Boot. It's not free, so if you're looking for a free alternative, you could try hashcat or ophcrack. Other great apps like John the Ripper are Offline NT Password & Registry Editor, Trinity Rescue Kit, LaZagne and L0phtCrack.
Kon-Boot is an application which will silently bypass the authentication process of Windows based operating systems. Without overwriting your old password! In other words you can login to your Windows profile without knowing your password.
Ophcrack is a Windows Password cracker based on Rainbow Tables.
Features
Cracks LM and NTLM Windows hashes Free tables available for Windows XP, Vista and 7 Brute-force module for simple passwords Audit mode and CSV export Real-time graphs to analyze the pas.
Windows stores its user information, including crypted versions of the passwords, in a file called 'sam', usually found in \windows\system32\config. This file is a part of the registry, in a binary format previously undocumented, and not easily accessible.
Trinity Rescue Kit or TRK is a free live Linux distribution that aims specifically at recovery and repair operations on Windows machines, but is equally usable for Linux recovery issues. Since version 3.
L0phtCrack is a password auditing and recovery application (now called L0phtCrack 7) originally produced by Mudge from L0pht Heavy Industries. It is used to test password strength and sometimes to recover lost Microsoft Windows passwords, by using dictionary, brute-force, hybrid...
Worlds fastest md5crypt, phpass, mscash2 and WPA / WPA2 cracker & Worlds first and only GPGPU based rule engine.
crowbarDMG is a dictionary attack tool for DMG and Spareimage files for Macs. It does require 10.5 Leopard. It really wasn’t worth the trouble to redo things to work on Tiger. It is completely free, so enjoy. Be sure to read the included PDF readme file.
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it's for a hashes brutforce.