If you are looking for free text chat room script then phpsunchat is the best chat script for you which is free to use for 30 days and if you like it then you can purchase its license.
Phpsunchat is written in php/mysql and uses ajax and jquery for making instant chatting on the web.
Phpsunchat requirements are only php/mysql and you can install phpsunchat on shared hosting server or any server which supports php/mysql language.
Phpsunchat offers special discount and special offers from facebook and from live chat so you can start doing live chat with them to get special offers right now.
visit www.phpsunchat.com to download free text chat room script and use it free for 30 days.