A chat server with authentication, persistent and searchable history, rich markdown formatting, video, private rooms, conversation highlighting, plugins, persisted notifications, code and table rendering, specialized link boxing, github hooks, bots, and many other features.
You can see it in action or use it on https://miaou.dystroy.org (anybody can create a room for public or private use on this server).
If you want to install Miaou, the installation documentation is available here.
Don't hesitate to come ask us some advices in one of the dedicated chat rooms 
And if you run your own server, please tell us, we're always happy to learn about installations.