I'm looking to add chat functionality to my site so that users of my site can chat with one another. Most chat widgets I have found online (i.e. such as the ones here) allow for chat between site administrators and users (for the purpose of customer support). As opposed to customer support, I want chat on my site to serve as an end functional feature. Is there a widget I can use to do this? I am looking for the simplest possible way to do this. Any pointers in the right direction would be helpful.

Thanks!