Nice list, I'll have to try a few! I've been having fun squeezing things into a Raspberry Pi 4 (4GB) and a thin client acting as a server (16GB), there's something about passively cooled compute that feels "free"...

Possibly of note from my services list:

victoria-metrics : currently at 230 MB ram because I send it all kinds of metrics

victoria-logs : 114 MB ram -- log aggregator

vl-agent : 25 MB ram (log forwarder for above)

ntp : 2 MB ram

librespeed : 16 MB ram (LAN speed testing, useful for wifi / quick ethernet checks)

corentinth/it-tools : 5 MB ram

mqtt mosquitto : 5 MB ram (message broker)

smokeping : 52 MB ram (latency history)

https://github.com/apenwarr/blip : 2 MB (live DNS latency checker)

lighttpd : 2 MB (static web server serving a single homepage)