Can wholeheartedly recommend OPNsense as an opensource firewall of choice. I run it at home, and we use it on a couple of Dell R210ii servers (4c/8GB RAM/dedicated Intel NIC) to run LAN gaming events ramping up to 1,200 active devices.
Migrated from pfsense because OPNsense actually had a usable API, so we can do things like add people into the Captive Portal programatically from our event check-in system.
Migrated from pfsense because OPNsense actually had a usable API, so we can do things like add people into the Captive Portal programatically from our event check-in system.