John - The Ripper

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John the Ripper is a free password cracking software tool.
Initially developed for the Unix operating system, it now
runs on fifteen different platforms (eleven of which are
architecture-specific versions of Unix, DOS , Win32 , BeOS ,
and OpenVMS ). It is one of the most popular password
testing and breaking programs as it combines a number of
password crackers into one package, autodetects password
hash types, and includes a customizable cracker. It can be
run against various encrypted password formats including
several crypt password hash types most commonly found
on various Unix versions (based on DES, MD5, or Blowfish),
Kerberos AFS, and Windows NT/2000/XP/2003 LM hash.
Additional modules have extended its ability to include
MD4 -based password hashes and passwords stored in
LDAP, MySQL, and others.