PA-220 fw for internet access.
An old workhorse, Synology DS1812+, for filesharing.
A mac mini with Ubuntu running Plex and Roon also hosting Dashy in docker.
A Hwg-ste to measure temp in my cabinet.
I host a RIPE probe.
An RPI4 running Zabbix.
My next project is moving from PA-220 to something in the 400 series (probably 415) so I can upgrade to newer PANOS.