Free UTM appliance: firewall, VPN, WAF and antivirus in one ISO.
HTTP proxy to block ads and customize webpages
Robust and flexible VPN network tunnelling
Anti Spam SMTP Gateway
Network Firewall Linux Kernel Module with Conflict Resolution Engine
A MAC address based user authentication system for campus-wide network
a secure, open source OS for use inside USEagency facilities
Personal firewall for linux desktop and android phone