Password Cracker

1)Cain and Abel : The top password recovery tool for Windows
UNIX users often smugly assert that the best free security tools support their platform first, and Windows ports are often an afterthought.
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2)John the Ripper is a fast password cracker, currently available for many flavors of Unix download

3)THC Hydra : A Fast network authentication cracker which support many different services download


4)L0phtcrack : Windows password auditing and recovery application
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5)Airsnort : 802.11 WEP Encryption Cracking Tool download
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6)Aircrack : The fastest available WEP/WPA cracking tool
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7)Brutus : A network brute-force authentication cracker
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8)Pwdump : A window password recovery tool
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9)RainbowCrack : An Innovative Password Hash Cracker
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Rootkit detection

1)chkrootkit: checks locally on a host for signs of rootkits
http://www.chkrootkit.org/download/
2)RootkitRevealer: a rootkit detection utility
http://technet.microsoft.com/hi-in/sysinternals/bb897445(en-us).aspx
3)Ice sword: http://www.antirootkit.com/software/IceSword.htm

4)Rootkit Hunter: one of the newer rootkit checking projects
http://www.rootkit.nl/projects/rootkit_hunter.html