Serve as a reverse proxy to protect your web services from attacks
A simple way to block access to the internet per app
OWASP Coraza WAF is a golang modsecurity compatible firewall library
OWASP ModSecurity Core Rule Set (CRS) Project
Jateway is a general purpose TCP/IP connection proxy
Personal firewall for linux desktop and android phone
Lomalarga is a VPN-like service based on SSH and Linux.