Donut Watercooler - Spark serendipitous conversations that recreate the office watercooler, right in Slack.
Songlio - Free musical guessing game: race friends to name that tune
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.
Rock On! - A song pop adventure - music trivia awesomeness
Watercoolr - Your always on drop-in virtual coworking space
SongPop - The world's biggest music trivia game. Now even better.