phpFreeChat is a free, simple to install, fast and customizable chat that uses by default files for message and nickname storage. It uses AJAX to smoothly refresh and display the chat zone and the nickname zone.
Absolutely horrible documentation. Bet you would get many more people using it if they knew how to install it and use it. Had to give all poor cause there's nothing showing a novice how to install and use it, unless you only want tech geniuses to have it. If I could use it maybe I would be able to evaluate it. You can get me a nycdarts at gmail if there someplace else with documentation and I'll change this review.