offline nt password registry editor

Windows stores its user information, including crypted versions of the passwords, in a file called 'sam', usually found in \windows\system32\config.

Free Open Source Windows Linux

John the Ripper

John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords.

Free Open Source Windows Linux Haiku

Kon-Boot

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.

Freemium Mac OS X Windows

Trinity Rescue Kit

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.

Free Linux

GoCrack

GoCrack provides APIs to manage password cracking tasks across supported cracking engines. Supported Engines - hashcat 3.6.0+

Free Open Source Linux