Social Games in Slack - Polly brings your WFH team together with interactive games
Nifty - Manage projects, work, and communications in one place.
Flinkit! - Web-hosted team building games for small and large companies
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.
Trivia for Google Chat - Team-building w/ fun quizzes, games right inside Google Chat
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.