Fabric Lobby

Server owners set a lobby position with x, y and z coordinates and a dimension. A lobby command teleports the player there, and a worldtp command returns the player to the place they were before running the lobby command. The saved location is kept when a player leaves the server, so a return trip still works after reconnecting. An option can send players to the lobby automatically when they join. Only the server needs the mod, so players connect without installing anything. Builds exist for Fabric only, for 1.21 and 1.21.1, with 0.1.0 for 1.21.1 as the latest file, under a Creative Commons Attribution Non Commercial No Derivatives 4.0 license; the project is not open source.