Cybatrons Free Network - Where FREE isn't a dirty word!

Darren's FlashChat - Put a highly customizable chatroom right on your website. Works with most PHP/MySQL forums and portals, or as a stand-alone chatroom. Can be used in a live-support configuration, as a registered users only chat, or as a free-for-all chat. (159 clicks)
PHP121 Instant Messenger - PHP121 is a web based instant messenger - written entirely in PHP. This means it will work in any browser on any operating system, including Windows and Linux, anywhere! (137 clicks)
phpFreeChat - A free, customizable chat system, that comes in several languages, supports many irc commands, private messenges, smoothly refreshes with AJAX, supports multiple rooms, moderators, and much much more! (169 clicks)
phpMyChat - An easy-to-install, easy-to-use multi-room PHP/DB chat. It's currently available for MySQL, PostgreSQL, and ODBC, and work for Oracle is in progress. It supports IRC-like commands, moderators, and is available in 37 languages. (181 clicks)
X7 Chat - X7 Chat is a chat script that supports a wide variety of features; themes, multiple rooms, different user levels, room owners, dice, actions, and more. If you're looking for chat for your website, this is one of the best. (150 clicks)