Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
iptables script in only one file
Anti Spam SMTP Gateway
OpenBSD based firewall distribution
A powerful network security tool, easy, safe and totally free.
Programmable completion code (bash) for ip[6]tables (netfilter.org)
Open source voucher management / hotspot system
Linux firewall distribution geared towards home and SOHO users.
Programmable completion code (bash) for ipset (netfilter.org)
network control and reporting