What are all the useful services I can host right on a raspberry pi?

Anything?

Basically anything you can run on a computer you can run on a Raspberry Pi.

Of course Raspberry Pis are Arm devices. So I guess proprietary software that doesn't support Arm (and the very rare FOSS software applications that go out of their ways to make it hard to use them on Arm for some fucking reason -- looking at you, Cura) would be a little more challenging. But aside from that... anything, really.

Depends what your needs are I run a mailserver a DNS/pihole and several of my own applications.

I used 10 as a big homelab, 1 as storage, 1 as a PHP server, 1 as a web server and VPN endpoint, 2 as docker swarm nodes.

Pihole. Gotify. Uptime Kuma.

My Dad wanted to move his printer to another location, and it doesn't have wifi. I set up a pi zero w as a cups server which the printer is hooked to. He can now remotely print to it from anywhere on his network.

I am using zero for drone fpv running openhd. And a rp2040 based board to control rc truck. I also have odroid c2 controlling a voron v0.2 3d printer.

At one point I had an FTP server, a website, a gemini capsule, home cinema and torrent running on a cluster.

Not I just have my home cinema and a torrent server.

• Home assistant! Super useful for automating anything.
• You could try out ROC for streaming audio between devices. I use to listen to my records and tapes with headphones while lying on the couch.

My pi 5 hosts jellyfin + qbit + the *arr stack + jellyseerr so people I share it with have an easy UI to get and watch movies/shows without me having to be involved.

I’ve also played with selfhosting small LLMs and image generators on it, but that was more for fun than for any useful result (even an 8gb pi 5 is very slow and can only run tiny models).

The next project is probably getting more external storage for it and hosting my own photo storage, but honestly I’m pretty happy already with what I have