We have Multiverse, RandomSpawn, and VoidSpawn. ClearLagg for entity removal.
./mcrcon -H localhost -P 9999 -p minecraft -t
https://github.com/ccodel/mcserver
https://github.com/cmu-rl/HerobrainePlugin
https://teilgedanken.de/Blog/post/setting-up-a-minecraft-server-using-systemd/