I had 15 of the 2013-era 5010 thin clients. Most of them have had their SSDs and RAM upgraded.

They’ve worn many hats since I’ve had them, but some of their uses and proposed uses were:

1. I did a 15 node Docker Swarm setup and used that to both run some of my applications as well as learn how to do horizontal scaling.
2. After I tore down the Docker Swarm cluster, I set them up as diskless workstations to both learn how to do that and used them at a local event as web kiosks (basically just to have a bunch of stations people could use to fill out web based forms).
3. One of them was my router for a good while. Only replaced it in that role when I got symmetric gigabit fiber. Before that, I used VLANs to to run LAN and WAN over its single ethernet port since I had asymmetric 500 Mbps and never saturated the port.
4. Run small/lightweight applications in highly-available pairs/clusters
5. Use them to practice clustered services (Multi-master Galera/MariaDB, multi-master LDAP, CouchDB, etc)
6. Use them as Snapcast clients in each room
7. Add wireless cards, install OpenWRT, and make powerful access points for each room (can combine with the above and also be a Snapcast client)
8. Set them up as VPN tunnel endpoints, give them out to friends, and have a private network

Of the 15, I think I’m only actively using 4 nowadays. One is my MPD+Snapcast server, one is running HomeAssistant, ,the third is my backup LDAP server, and one runs my email server (really). The rest I just spin up as needed for various projects; I downsized my homelab and don’t have a lot of spare capacity for dev/test VMs these days, so these work great in place of that.

These are mini PCs right? So you want something with a room full of humans or some type of local online service. Anyway, not a purely computer project.

Library terminals and game room come to mind, but neither are for installing at home.