A firewall for humans.
An iptables IPv4 firewall and traffic shaping program
ipset set listing wrapper script
Programmable completion code (bash) for ip[6]tables (netfilter.org)
Programmable completion code (bash) for ipset (netfilter.org)
This tool locks down Linux and UNIX systems.
Sonicwall Configuration File Reader
Drop specified IP n seconds remotely, auto-undrop it when timeout.