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

Edit By BS Editor: CF_debug was the first debugging tool written for ColdFusion. The first version was released about the same time that Allaire release ColdFusion v3.0. The goal of CF_Debug is to allow you to easily monitor execution times and values of variables within your scripts. The output is displayed within a pop-up window created using JavaScript, so the output of the original Template is not altered.