A webchat software written in PHP and MySQL. It is compatible with every browser known today, even text-based ones. [Open source, GPL]

(formerly SimpleChat!) Fast, reliable, XHTML compatible web chat written in PHP and JavaScript.

A nice script that lets create a simple chat in a few minutes. Requires MySQL. [Open source, GPL]

Features include unlimited and private channels; moderators, whisper mode, timed sessions and multiple language support.

A chat application that features multiple rooms, no browser refresh, database back-end, emotions, private messages, and multiple language support.

Allows users to post little blurbs on your website like a small guestbook/chat box. Inline or IFRAME, powered by mySQL.

Modular service bot for IRC channels.

A PHP chat script with unlimited users, rooms, and messages, IRC style commands, full message formating. [Freeware]