Show HN: lazymc – Put your Minecraft server to rest when idle Posted by timvisee on Thursday November 11, 2021 @09:33AM from the show-hn dept. https://github.com/timvisee/lazymc ( 5 comments | 14 points | on HN )
https://mgdm.net/weblog/systemd-socket-activation/
Certainly not as nicely integrated, but a game-agnostic approach - similar to inetd from the older days.
Should work with anything that uses the standard Minecraft protocol to connect to the game.