Sygate Personal Firewall. It had a simple interface, nothing flashy. It was possible to simply define custom firewall rules. It was a Windows program, yet it fe

Sygate Personal Firewall. It had a simple interface, nothing flashy. It was possible to simply define custom firewall rules. It was a Windows program, yet it felt like it had so much control as what a Linux firewall would. It just worked and was quick. Then it got bought up by Symantec and was killed off.