I have finally discovered what I believe to be the best Open Source (and therefore free) software to use in a Live Chat scenario! Open Web Messenger (or Mibew) developed by one or two guys is incredible.
Frequent updates and a friendly support Forum with quick responses led me to like it very quickly indeed. If you’ve been looking for something like this and don’t want to pay vast amounts for things like Live Person!
Open Web Messenger even has Live Person look-a-like skins – they have even developed a client for Windows with others in the works I do believe.
Web site link: http://openwebim.org/