Molehunt

Molehunt turns a Minecraft world into a social deduction round. Players start as innocents or moles, and the mod ends the game once the timer expires or the innocents are all dead. Moles can see the names of the other moles, so they can coordinate, while everyone else has to work out who is hiding among them.

To make the round fit a shared world, the mod changes several defaults: player nametags are disabled, player list and chat messages sent with commands such as msg, tell and w are blocked, and death advancement messages are turned off. Every player is given the same skin. A world border is set at the start and shrinks slowly over the entire game, while the Nether and End portals are disabled.

Almost everything in the round is configurable, and most values can be changed through gamerules that the mod adds to the gamerule command, each named with the molehunt: prefix. The author describes further options in an online wiki. Molehunt is published for Fabric and runs on client and server, so the server and every player need the mod. The mod is released under the GNU Affero General Public License v3.0 only, and its source code is open.