What is the best free firewall for a Windows 2000 system with low memory?

For a Windows 2000 system with low memory, ZoneAlarm Free Firewall is often recommended due to its lightweight nature and user-friendly interface. It provides essential protection features, including inbound and outbound traffic monitoring, without consuming excessive system resources. Another option could be Comodo Firewall, which is also relatively lightweight and offers robust security features suitable for older systems. However, ensure that any chosen software is compatible with Windows 2000, as support for this operating system has largely diminished.