A firewall for humans.
Anti Spam SMTP Gateway
iptables script in only one file
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
An iptables IPv4 firewall and traffic shaping program
blocklists for openbsd,freebsd,linux,iptables,bsd pf,pf,ipfilter
ipset set listing wrapper script
A powerful network security tool, easy, safe and totally free.
Programmable completion code (bash) for ip[6]tables (netfilter.org)
shell program to automatically configure freebsd as a firewall
Block or allow connections by country address blocks
Open source voucher management / hotspot system
Linux firewall distribution geared towards home and SOHO users.
bash programmable completion for conntrack-tools (netfilter.org)
Programmable completion code (bash) for ipset (netfilter.org)
High interaction honeypot solution for Linux based systems
Ferramenta Web para Administração de Firewall