HalfHeart

A Fabric mod for Minecraft that lets server operators enable or disable the End and Nether dimensions at will. When a dimension is disabled, portal blocks are blocked and players attempting to enter receive an action bar message.

Login Daddy is a Fabric mod for private friend servers(Mainly Offline-Mode servers). Requires players to have the mod installed on their client, be on the whitelist and authenticate with a password before they can play.