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I just started using this shoutbox and it works good so far:
https://xoops.org/modules/repository/singlefile.php?cid=97&lid=1436
As far as chat modules go, I haven't worked with any of them, but I hear this one works ok:
https://xoops.org/modules/repository/singlefile.php?cid=8&lid=1295
Make sure to check the authors' sites to make sure that they are the latest functional versions.