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I assume that since you posted this in the free services section, you're looking for a free live chat system? If so, I would highly suggest LiveZilla. By far the best free live chat software out right now, in my opinion.
I can recommend you PureChat which is a free chat software. If you are looking for a chat with more features and secure cloud hosting, you could have a look at Kayako or LivePerson. I haven't tried LivePerson on any of my websites but both of them are very popular even among the leading web hosts.