iptables script in only one file
A simple, portable port scanner
A powerful network security tool, easy, safe and totally free.
Programmable completion code (bash) for ip[6]tables (netfilter.org)
PeerGuardian - a privacy oriented firewall application
Webinterface to (un)ban IPs in Fail2Ban
KnockIt! is a port Knocking tool for MAC OSX
This tool locks down Linux and UNIX systems.
Detect Flooder IPs, Reduce Attack Surface against HTTP Flood Attacks