Anyone know of a good and fault tolerant chat application and/or API [closed]

Question

Does anyone know of a good in-browser chat API and/or completed solution?

I'd be interested in both open source and closed source options that would have to be purchased.

Here are some ideal requirements:

• Message encryption
• Written in a language and/or using frameworks optimized for chat (like NodeJS / Erlang / Javascript using WebSockets, etc).
• Highly fault tolerant
• Embeddable in a browser with a fluid and friendly UI
• Highly customizable (if a completed solution)

Thanks a ton!

Answer 1

ejabberd is a Jabber/XMPP instant messaging server.