Ophcrack is a free Windows password cracker based on rainbow tables. It is a very efficient implementation of rainbow tables done by the inventors of the method. It comes with a Graphical User Interface and runs on multiple platforms.
» Runs on Windows, Linux/Unix, Mac OS X, ...
» Cracks LM and NTLM hashes.
» Free tables available for Windows XP and Vista.
» Brute-force module for simple passwords.
» LiveCD available to simplify the cracking.
» Loads hashes from encrypted SAM recovered from a Windows partition, Vista included.