Mibbit IRC is a Scripts software developed by kmillecam. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Mibbit IRC:

Edit by Marydown: The developers at Mibbit.com have created a very nice (AJAX) widget that gives your community members access to IRC channels via a window (iFramed widget) on one of your site's pages.

This module makes it easy for administrators to add the IRC widget to their Drupal sites.