Install the plugin jar file in your hub server(s):
1.13.2+         ServerSelectorX-Premium-2.2.0.jar           Requires Java 11+
1.7.10-1.12.2   ServerSelectorX-Premium-2.2.0-legacy.jar    Requires Java 8+

Wiki: https://github.com/ServerSelectorX/ServerSelectorX/wiki

SSX-Connector is for sending data about a server to the hub server, so it is possible to display detailed server information in the menu. The one SSX Connector jar file works with all versions from 1.7.10. Install it on all servers: https://github.com/ServerSelectorX/ServerSelectorX/wiki/Installing-SSX-Connector

Sponge
experimental connector available here: https://cloud.derkad.es/s/6s2LsiFREEXG7sS/download

Forge and fabric are not supported at this time.