Running a Minecraft server on OpenBSD -current
dataswamp.org
dataswamp.org
I do run it inside of tmux, no autostart, but you can easily interact with the MC-console.
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For minecraft classic on OpenBSD look up Classicube (native C) and MCGalaxie (runs with mono).
By pure coincidence, I stumbled upon a plugin for PaperMC [1] which together with a proxy server allows exactly that! Now my server stops when nobody is using it so I can save some RAM on my old machine.
I'm not sure how they did it, but it also allowed me to use the same minecraft account for me and my kids while the server is in online mode. This way we could enable our kids to play with their friends while they all share a single account.