Trivia for Google Chat - Team-building w/ fun quizzes, games right inside Google Chat
Donut Watercooler - Spark serendipitous conversations that recreate the office watercooler, right in Slack.
Infinite Music Trivia - How much do you know about music?
Poll Everywhere - Audience response system that uses mobile phones, twitter, and the web. Responses are displayed in real-time on gorgeous charts in PowerPoint, Keynote, or web browser.
Trivia for Slack - Fun team-building with 1000s of quizzes right inside Slack
Watercoolr - Your always on drop-in virtual coworking space