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I wrote an open source XMPP-based chat client: https://conversejs.org

There is a Django add-on for it as well: https://pypi.python.org/pypi/django-conversejs

In the latest unreleased version (0.8), you only have to load converse.min.js and converse.min.css in your HTML.

The 0.8 release should go out within the next few weeks.

If you are willing to build on go, we open sourced the "wc" (WebChannel) library which handles all of the messages for dropinchat.

http://gopkg.in/samegoal/wc.v0

Also, out of curiosity, if dropinchat provided a virtual appliance so that you didn't need to send the messages off network would that address your security concerns?

Try Jappix mini (https://mini.jappix.com/). Uses XMPP instead of reinventing the wheel once again.

Also, if you need a generic chat, try Candy (https://candy-chat.github.io/candy/). Again, XMPP-based.

You can take a look at Mozilla's TogetherJS (https://togetherjs.com/). It has a chat functionality and you can host it on your own.