Prosody (XMPP server), a git instance, a searXNG instance, Tandoor (recipe manager), Next Cloud, Syncthing for my phone and my partner’s (one could say Next Cloud should be enough but I use it for different purposes), and a few other stuff.
It doesn’t even use an eight of its total RAM and I’ve never seen the CPU go past 20℅. But it uses a lot less power than the thin client it replaced so not a bad investment, especially considering its price.
My first @home server was an old defective iMac G3 but it did the job (and then died for good) A while back, I got a RP3 and then a small thin client with some small AMD CPU. They (barely) got the job done.
I replaced them with an HP EliteDesk G2 micro with a i5-6500T. I don’t know what to do with the extra power.
Windows games running better with Wine than on Windows has been a thing for at least 20 years, Proton (which is a fork of Wine, people tend to forget) didn’t invent anything.
Searxng is very good, I like it a lot. As for OSM, I didn’t even know it could be hosted.