Incognito

Incognito is a server mod that changes how players identify each other. Other players appear as Unknown in the tab list and above the chat, and only the player's own name is shown. The vanilla global chat is disabled, and chat reaches only players within a configurable radius. Death messages, advancement messages and join and leave notices are hidden from players who do not know each other, so nobody learns who is online from them.

Two players become acquainted by right-clicking each other and sending an acquaintance request. The other player can accept or decline the offer, and once accepted both players see each other's names and receive join and leave messages. Private messages through the msg, tell and w commands are disabled. The Incognito forget option lets a player drop an acquaintance and return to anonymity with that player. Incognito runs on the server alone, so players join without installing anything, and it is published for Fabric and Forge for 1.20.1, 1.21.1, 1.21.11 and 26.1.2.