Trivia for Google Chat - Team-building w/ fun quizzes, games right inside Google Chat
SuperTuxKart - 3D arcade-style MK-like kart racing game
Flinkit! - Web-hosted team building games for small and large companies
TrackMania - The most popular online PC racing game.
Social Games in Slack - Polly brings your WFH team together with interactive games
TORCS - TORCS, The Open Racing Car Simulator is a highly portable multi platform car racing simulation.