“Updates to General free tools this week include MindTerm, PGP, PGPenvelope, Stunnel, Ssldump, Tripwire, BIND, Tcpdump and Linux Kernel.”
“Auditing and Intrusion Monitoring tools include Snort, RazorBack (which seems interesting), NetSaint, LIDS, ICU, SAStk and 3 other tools.”
“Firewalls for Unix/Linux/BSD & Cross-platform include Firewalk, Ferm, GShield, GShieldconf, IPtables, FirewallLogDaemon and 5 other tools.”
“Tools for Unix/Linux/BSD & Cross-platform include Libnet, Zebedee, Anomy Sanitizer, APG, SecureFTP, Sectar, Linux VPN masquerade and 10 other tools.”