Chess: a board game made popular by the 2020 Netflix series The Queen's Gambit and then made unpopular again by the 2022 Carlsen/Niemann debacle.
Cpjsmith.uk Abhors Hilarity: a card game for people who hate themselves.
MLP Draft: draft the My Little Pony CCG from Print and Play boosters or a digital copy of I8Pages' cube.
RPS: a chatroom where you can challenge anyone to rock-paper-scissors or variants.
Random number generator: distributed random number generation that even the server can't rig.