once you have installed archlinux you'll have a small computer with no screen running a linux system. It has network connectivity, all the ecosystem to back it up and even some GPIO capabilities (if you dare use a soldering iron on it).
If performance is not an issue, then the sky's the limit.
I've used mine as an asterisk server, some have used it as web server, as streaming server, I intended it as a base for a robot as some point.
Picture this as a netbook without a screen and forget about running windows on it.