Live Chat by ContactUsPlus is a WordPress plugin by abenari that sdds a Live Chat toolbar to the top right of your WordPress site.
Some features are free and others are chargable.
Live Chat features include:
No client software to download
Service live chats from any browser, including smart phones
Service multiple visitors simultaneously
Attach files to a chat
Canned responses (pre-configured text added to a chat with a single click)
Logs unsuccessful chat attempts
Includes a contact form as an alternative to live chat
Reliable and secure
SPAM free
No need for your visitors to leave the page (or sale process) in order to send you a message
Complete chat history available for visitors and for the website administrator
The live chat service is provided by ContactUsPlus.com. See http://www.ContactUsPlus.com for a full list of features.
“By default, only the Contact Us option will be displayed in your website toolbar (this opens a contact form). The Live Chat option is ONLY displayed when you are logged in to your ContactUsPlus.com account ready to service live chats.”
Download and info: http://wordpress.org/extend/plugins/live-chat-by-contactusplus/