MiniHelp! 

MiniHelp! is a PHP script that allows you to interact with your visitors, offering support and/or sales in real time through chat. When the visitor requests help, the operator is informed through a visual and sonorous signal.
chat customer support operator

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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LiveServiceDesk 

POWERFUL AND AFFORDABLE LIVE CUSTOMER SERVICE SOFTWARE LiveServiceDesk empowers small web businesses with the ability to offer live customer service. Turn browsers into lifetime customers by answering questions before they click to a competitor site!
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AliveChat 

AliveChat allows you to connect with and track your web site visitors in real-time via a browser based live chat interface. Your company can now offer live support software to customers while increasing sales with Proactive chat.
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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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