Make a fort
Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Kubenetes or k3s and some volunteer computing programs. Or mine monaro to offset the power bill of your other servers.
Openstack cluster!
I'm not sure about anything useful. Best thing would probably be to install Linux and donate them to people in need. For experimentation, sure, set up a Beowulf Cluster, learn FreeBSD, Orchestration, Kubernetes, Ansible... Use them to test your microservice architecture software projects, software-defined networking...
Build a proxmox cluster and teach yourself about high availability services. Tear it down and do it again with xcp-ng. Repeat using more and more complex architectures
I would want to do a cluster. Just to learn how that works. But just thinking of the electricity cost, I would personally donate them.
Unless you're redlining your systems 24/7, the load really shouldn't be that bad.
I run 3x 7th gen Intel mini PCs in a Proxmox cluster, plus a 2014 Mac mini on a 4th gen i5 attached to 3x 4TB drives in RAID5 (my NAS), plus an 8TB backup drive. I also run Home Assistant on a Lenovo M710q Tiny (separate because I use Zigbee and don't wanna deal with USB passthrough and migrating VMs and containers...). Total average draw is ~100W.

MY experience with the ZigBee dongle and HA in a docker container has been pretty positive. It was plug and play, IIRC.
Sell them and buy something newer
Seriously though the going rate for old hardware isn't that different from the newer stuff. Try price matching 3rd gen to 6th or 7th gen.