Protecters From Nukes:

NONETBIOS

PORTSCAN V1.2   

ANTINUKE

NUKE NABBER 2.0 A

WIN SOCK UPDATE   

ICMP Tracer

Global Security 32-BIT

Satan 1.1.1

Internet Security Scanner

Cops v1.04

Tiger v2.2.3

NUA Attacker

TCP Dump v3.0.2 (ELF)

Argus

Traceroute