WhosOn 

WhosOn is a real time log file analyzer. It displays a list of currently active visitors and allows visitors to chat to you. Also includes real time error and exception reporting plus historical reporting via a SQL database.
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Boldchat Operator Client .NET 

Chat with visitors on your web site. Great for sales and customer service chats. See all visitors on your web site. Initiate chats with visitors. Customize your chat window with your logo, colors, etc. Display a chat button showing your availability.
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