At a previous employer we used Hipchat ( https://www.hipchat.com/ https://www.hipchat.com/ ) for this. Hosted service, had logging (which was exceedingly useful

At a previous employer we used Hipchat ( https://www.hipchat.com/ https://www.hipchat.com/ ) for this. Hosted service, had logging (which was exceedingly useful, it turns out), and a bunch of other features.