In the past year, we’ve had a renewed interest in building collaborative applications and virtual spaces where people can come together. While full-featured multiplayer networked games can be complex, we’ve found a simple socket.io server on Glitch to be an effective tool for rapid multi-user prototyping.
Just Enough Multiplayer: Prototyping Realtime Multi-User Spaces with Socket.io
Bluecadet's virtual water cooler