Alfandega is a strong and modular iptables firewall. It provides NAT, port-forwarding, spoofing list, blacklist of crackers and spywares sites, protection for TCP/UDP scans, DOS/DDOS and Smurf attacks, TCP tuning, DHCP/PPP support, and much more.
PQAdmin is a frontend to configure Linux print quotas
support using Webmin.
A tool for securing DNS communications between a client and a DNS resolver.
A polyhedral extraction tool (PET).