Ophcrack
Ophcrack is a free Windows password cracker based on rainbow tables, offering a Graphical User Interface and compatibility with Windows, Linux/Unix, and Mac OS X. It can crack LM and NTLM hashes, has free tables for Windows XP and Vista/7, a brute-force module, audit mode, CSV export, real-time password analysis graphs, LiveCD support, and the ability to dump and load hashes from encrypted SAM files. It is free and open-source software under the GPL license.
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