OPNsense is an open source, easy to use firewall and routing platform
ipset set listing wrapper script
Powerfull Web Application Firewall for PHP
Prevent and Protect Your HTML5 Video, Music , Audio From Download Free
Programmable completion code (bash) for ip[6]tables (netfilter.org)
Simulating an IP packet traversing the Linux kernel.
360-FAAR Analyze FW1 Cisco Netscreen Policy Offline Using Config/Logs
Webinterface to (un)ban IPs in Fail2Ban
Network Firewall Linux Kernel Module with Conflict Resolution Engine
Block or allow connections by country address blocks
Open source voucher management / hotspot system
Extract and Convert Juniper Firewall Policies to CSV
Linux firewall distribution geared towards home and SOHO users.
bash programmable completion for conntrack-tools (netfilter.org)
High interaction honeypot solution for Linux based systems
Programmable completion code (bash) for ipset (netfilter.org)
pfck - pf check - organizes flow information by host