Live chat plugin

Hi all,
I'm prepared adding Live Chat to my website allowing registered users talking amongst them onsite. On searching plugin I found;
FlexTalk – Live Chat

FrescoChat Live Chat

15 Free WordPress Live Chat Plugins – Free download
http://phuocub.com/2013/11/free-word…free-download/
Kindly advise which of them shall I install? Thanks
satimis
Live chat plugin

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