jbTop is a Live Chat service provider for your web site.

Your website visitors may click on the Live Chat button on your web page, it opens a  Visitor Popup Messenger in the visitors browser. The visitor fills in the information fields,  and then clicks on the "Start Chat" button. On your side,  you receive the visitor's call in a Jabber Instant Messaging program.  A private chat window opens up, and you and your visitor can chat  with each other via real-time chat  messaging.

You may use any XMPP/Jabber software to connect  jbTop  Jabber server.