Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
A secure, feature-rich, customizable embedded Linux network appliance
Anti Spam SMTP Gateway
OpenBSD based firewall distribution
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)
Open source voucher management / hotspot system
bash programmable completion for conntrack-tools (netfilter.org)
Firewall Management Script
SSH Java client GUI for Unix, Linux administration and monitoring
network control and reporting
Block incoming traffic from Tor network with IPTABLES
Easy to use firewall for linux beginners.