A firewall for humans.
OpenSnitch is a GNU/Linux port of the Little Snitch firewall
iptables script in only one file
Share a VPN connection with VMs or containers
Anti Spam SMTP Gateway
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
A simple, portable port scanner
An iptables IPv4 firewall and traffic shaping program
Bash script to enable the firewall on startup of your Ubuntu server.
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)
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)
Firewall Management Script