- AntiCrack
 - Checks vulnerability of UNIX passwords in the same manner as Crack does, but it's faster because it checks "raw (not encrypted)" passwords. - MLD's Unix Security Page
- Unix & TCP/IP Network Security Page. Focused on system penetration and system designs which lead to security failures. Software available online.
- Securing NIS
- UNIXsecur
- UNIX security knowledge base covering security, firewall, and current versions.
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