PlayPlay.io - Chess and Ping Pong tracking in Slack
Pinpon - The ping pong bot for Slack
Papio - Friendly foosball scorekeeper and stats tracker for Slack
Slack Poker Bot - A bot that turns Slack into a Texas Hold'em client
Pongbot - Slack bot for ping pong tracking.
Cards Lacking Originality - A simple and elegant online Cards Against Humanity clone