XHTML Chat is barely more then a single html page + CSS + javascript. The server side bit is as small as it can be and could be accomplished with almost any available technology (down to php + textfile). This looks very well revolutionise the way the web looks and feels today.
Apart from this being a chat you can use XHTML Chat as:
All of these could degrade gracefully if javascript is not available. XHTML Chat (including XHTML, CSS, Javascript, PHP, all images) ,is licensed under a Creative Commons License as well.
Requirements: -
Demo: http://chat.plasticshore.com/
License: Creative Commons License
Now you can chat with visitors to your website instantly using text or even voice! ChatStat provides every website owner, and eCommerce store with live interaction and tracking technology, making every dialog with their prospects and customers as effective as if they walked into a storefront and were greeted by their most talented staff. ChatStat’s innovative Live Customer Interaction system applies the Web 2.0 paradigm to instant ‘live’ human interaction and web analytics. There are many exciting features e.g. Live Translation for text chat in up to 40 languages and get Website Analytics displayed using MovingGraph Technology. Proactive 2-way live chat is free for up to two operators!
Requirements: No Requirements
Demo: http://www.chatstat.com
License: License Free ( Up to 2 Operators )
Plugoo enables you to chat directly from your Instant Messenger with any visitor of your blog, personal webpage, e-sales site or even your web application. When you’re logged into your Instant Messenger (Windows Live Messenger, Yahoo! Messenger, AIM, GoogleTalk, Jabber or ICQ), you can receive in real time all the comments of your visitors or any question they might ask, and answer instantly!You can also change colors, title of your Plugoo, and visitors can choose a nickname to contact you.

Requirements: Any Modern Browsers
Demo: http://www.plugoo.com
License: License Free

YShout is a lightweight yet full-featured package that allows you to easily add an interactive shoutbox to your website. So that you can communicate with your visitors in real time, and also provide a great chat room for the visitors to discuss on your website or web application. You can tailor YShout’s appearance to fit your website perfectly by using CSS. YShout 5 features a completely rebuilt control panel. It contains some new preferences, as well as a lot of returning favorites.

Requirements: PHP and Javascript
Demo: http://geekchat.net/yshout5/example/
License: Donationware
22 Jun
Posted by Ray Cheung as BSD License, Chat
Ajax im is a browser-based instant messaging client that you can use it freely on your website projects or web applications. 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. It is very easy to install and the user interface is so elegant.
Requirements: Internet Explorer 6+, Firefox 1.5+, Opera 9+, Safari
Demo: http://www.ajaxim.com ( Username: test Passowrd: test )
License: BSD License




