OpenSnitch is a GNU/Linux port of the Little Snitch firewall
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
Anti Spam SMTP Gateway
Generació regles IPTables per Continents o Països
Tool to ping hosts through firewalls blocking ICMP
An iptables IPv4 firewall and traffic shaping program
ipset set listing wrapper script
track log files, block intrusions, and much more
High interaction honeypot solution for Linux based systems