AJAX Chat is a free and fully customizable open source web chat software implemented in javascript, PHP and MySQL.

AJAX Chat integrates nicely with phpBB, MyBB, PunBB, SMF, vBulletin and other PHP community software.
Features:
- Easy installation
- Usable as shoutbox
- Multiple channels
- Private messaging
- Private channels
- Invitation system
- Kick offending Users
- Ban offending Users
- Ignoring offending Users
- Online users list with user menu
- Emoticons / Smilies
- Easy way to add custom emoticons
- support support
- Optional Flash based sound support
- Optional visual update information (changing window title)
- Clickable Hyperlinks
- Splitting of long words to preserve chat layout
- Flood control
- Possibility to delete messages inside the chat
- IRC style commands
- Easy interface to add custom commands
- Possibility to define opening hours for the chat
- Possibility to enable/disable guest users
- Persistent client-side settings
- Multiple languages (auto-detection of ACCEPT_LANGUAGE browser setting)
- Multiple styles
- Chat window adjusts to browser window with included styles
- Easy layout customization through stylesheets (CSS) and template system
- Automatic adjustment of displayed time to local client timezone
- Standards compliance (XHTML 1.0 strict)
- Accepts any text input, including code and special characters
- Multiline input field with the possibility to enter line breaks
- Message lenght counter
- Realtime monitoring and logs viewer
- Support for unicode (UTF-8) and non-unicode content types
- Bandwidth saving update calls (only updated data is sent)
- Optional support to push updates over a Flash based socket connection (increased performance and responsiveness)
- Survives connection timeouts
- Easy integration into existing authentication systems
- Sample phpBB2 integration provided
- Sample phpBB3 integration provided
- Sample MyBB integration provided
- Sample PunBB integration provided
- Sample SMF integration provided
- Sample vBulletin integration provided
- Separation of layout and code
- Well commented Source Code
- Developed with Security as integral part – built to prevent Code injections, SQL injections, Cross-site scripting (XSS), Session stealing and other attacks
- Tested successfully with Microsoft Internet Explorer, Mozilla Firefox, Opera, Safari and Konqueror – built to work with all modern browsers

Requirements:

· Server-Side:
· PHP >= 4
· MySQL >= 4
· Ruby >= 1.8 (optional)
· Client-Side:
· Enabled javascript
· Enabled Cookies
· Flash Plugin >= 9 (optional)
Download Link

http://miniup.net/ajax-chat-0-8-1-2