This plugin, installed on a Velocity proxy, can start and stop your backend servers as needed using bash commands. Additionally, you can start and stop the servers using the commands ondemand start <server> and ondemand stop <server>.

The waiting room must be named wait-limbo in the Velocity config file.

command list:

ondemand start <server> starts your server

ondemand stop <server> stops your server

ondemand status <server> shows them the current status of the server

ondemand disable <server> disable automatic start and stop

ondemand enable <server> reactivates automatic start and stop

ondemand reload reloads the config

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I'm glad it works with every Minecraft version, but I haven't tested it with all of them.