Ring4 Meeting - Dead simple video conferencing - free, in browser
Tetris.com - Tetris Friends is an Online, Puzzle, Single and Multiplayer video game created by Tetris Online, Inc.
Stork.ai - AI-Based Collaboration for Hybrid Teams. Rich media messaging, advanced video and voice conferencing, auto-transcribing and screen sharing. Serendipitous meetings at the water-cooler with your human and AI teammates.
Cultris II - Cultris II is a Puzzle, Single and Multiplayer video game with Split Screen element.
openmeet - Account free video conferencing with a rooms component that lets you use VC within a physical meeting room. The server can also be hosted in your own cloud for extra privacy/security.
Not Tetris 2 - Not Tetris 2 is an Addictive Physics-based puzzle video game that offers a new style of Tetris experience in which block is no longer bound to the usual grid.