BSDI-style extended DES-based crypt – BSD/OS, *BSD (non-default).'bigcrypt' – HP-UX, Tru64 / Digital Unix / OSF/1.Traditional DES-based Unix crypt – most commercial Unix systems (Solaris, AIX, …), Mac OS X 10.2, ancient Linux and *BSD.John the Ripper Pro currently supports the following password hash types (and more are planned): It can be run against various encrypted password formats including several crypt password hash types most commonly found on various UNIX flavors. It is one of the most popular password testing/breaking programs as it combines a number of password crackers into one package, autodetects password hash types, and includes a customizable cracker.
Initially developed for the UNIX operating system, it currently runs on fifteen different platforms (11 architecture-specific flavors of Unix, DOS, Win32, BeOS, and OpenVMS).
New version of John The Ripper has been released, John the Ripper is a free password cracking software tool.