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A powerful but very easy-to-use shoutbox / tagboard / chatterbox message board system that you display on your site in iframes. We host the script and database - all you need to do is paste a few lines of HTML into your pages! There's a FREE version, and an ENHANCED version ($15/yr). Features include: smilies, bbcode, autolinking, name-remembering, spam prevention and language filtering, smart autorefresh, simple admin, onliner counter, in-box post delete. The admin panel is very comprehensive and the whole service is extremely fast and reliable.
Price: free

This is a chat system written in PHP and that uses MySQL on backend for storing data. It features: frame-based, display user list, user filter capability, and much more.
Price: Free

Chat module allows members to talk in predefined and dynamic chat rooms. Use it to create virtual meeting place where people from all over the world can meet and talk.Features: Template-based design;Multiple chat rooms. Rooms can be predefined, and can be dynamically created by users (password-protected or not). Dynamic room lives while at least one user is in it;User ignore list;Smiles;Bad words filtering and more... Check our demo !
Price: $79.00

ChatBot is a fast chat robot/automatic autoresponder. You can use it, for example, on FAQ pages with a large amount of questions/answers. ChatBot stores all data in single csv file (no database needed) and has an easy-to-use questions/answers admin interface.
Price: Free

Another chat box but this one is pretty powerful, easy to customize to fit anyones needs. It offers an installation script so that even beginners who know nothing about PHP can set it up.
Price: Free

ChatExpress is a PHP/MySQL-based real-time chat application written in Spanish. It requires the following password to open up the zip file: CT4e11snEt04.
Price: Free (GPL)

What was a fast, simple chat script has become an even faster, more advanced, chat script. Version 2 has added these features: Easy to use install script, advanced but easy to use admin panel, boot users, emoticons, edit templates online, and much more.
Price: Free (GPL)

Chats is a PHP chat server with Java 1.1 client. For people that need to chat enable a web site and want to avoid the annoying "full-refresh HTML only" solution, Chats provides an ideal solution. Its Java 1.1 client has been tested on the 3 latest browser generations, and the traffic generated on the server is much smaller, only new messages being sent to the chatter, not the last couple of dozens as in the standard full refresh implementation. The chat client uses as server the web server/coupled with PHP and MySQL.
Price: $35

Chatter2Go is a standalone version of flooble's popular Chatterbox hosted service. Upload this PHP script to your web server, configure it through the web-based interface and add the insertion code to any number of pages! Chatter2Go does not require a database to work, and is a breeze to get started with.
Price: Free

ChatXM will have visitors to your site coming back again and again. And that means more sales and more traffic for you. The client has absolutely nothing to install or download. It all works seamlessly within your client's browser. Our standard ChatXM product can be further customized to fit your site's needs and requirements. If this is something you would like to explore, please contact us for more information and quotes. However, customization is not required and Chat XM will work out-of-the-box as is. Give your visitors something to talk about. Get Chat XM now!
Price: $199.95