pretty cool web chatroom if i say so myself
the server: https://repl.it/@rafrafraf/chatroom-server
the server is in python using the sanic library for requests.
you can join any room(provided you have the password if its locked) and talk to everyone in real time, and see who else is in each room.
you can create your own room, upload a background image for the room, name it and put a password on if you want to make it private.
i made the server and client from scratch in under 2 days so i'm quite pleased with it - i'm 17 doing a level computing.