OpenSnitch is a GNU/Linux port of the Little Snitch firewall
A simple way to block access to the internet per app
Simple tool to configure Windows Filtering Platform (WFP)
LuLu is the free open-source macOS firewall
A high-performance MySQL proxy
Serve as a reverse proxy to protect your web services from attacks
A firewall for humans.
HTTP proxy to block ads and customize webpages
Next Generation Open Source Firewall
Robust and flexible VPN network tunnelling
Firewall log analyzer
Manage port forwardings via UPnP
Network Security Appliance Linux Distribution
Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
iptables script in only one file
RazWall Firewall
Antivirus eCAP adapter for Squid 3.1 and above.
Anti Spam SMTP Gateway