https://irata.online/#features https://irata.online/#features seems to cover it? It's a multi-user terminal system where you can log in, send text to other user

https://irata.online/#features https://irata.online/#features seems to cover it? It's a multi-user terminal system where you can log in, send text to other users, and run games and applications. It's not clear if the server software is available, but the links are to various client software for connecting to their service.