Werefox Software's collection of services run on two server machines currently, hosted through a reverse SSH connection on a Linode VPS.

System: Intel NUC
Model: 8i5BEH
CPU: Intel i5 8529U eight-core @2.3-3.8Ghz
GPU: Intel Iris Plus Graphics 655
RAM: 16 Gb @2400Mhz
OS: Ubuntu Server 20.04

Note: I have two of these set up, but only one handles services that are outward facing at the time of writing.

System: Raspberry Pi 4 (x2)
Model: B Rev 1.4
CPU: BCM2835 four-core @1.5Ghz
RAM: 8 Gb
OS: Ubuntu Server 20.04