The ringMon monitoring page now has a simple chat support. There is one chat nick available for each active nREPL session. To find out more info about active sessions expand ReplSessions section of the monitoring data tree.
You will be given default unique nick when your session is created. To change it uncheck 'Confirm', modify 'Chat as' and check 'Confirm' again. Your nick will be remembered on the server side until this application is restarted.
The 'Send' button will send the contents the nREPL input window (or just a selection, if active) either to all connected people or to a single recipient. Other people messages will appear in nREPL output window.
Chat functions are also accessible to your Clojure scripts via ringmon.api namespace:
Here is a simple script to change your chat nick: