AJAX Instant Messenger
AJAX IM ("asynchronous javascript and xml instant messenger") is a browser-based instant messaging client. It uses the XMLHTTPRequest object in JavaScript to send and receive commands to and from the server. No refreshing of the page is ever needed for this "web application" to work, as everything is updated in real-time via JavaScript.

I liked the design and the general layout of the application, easy to use and its written in PHP. You can find a demo here











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