WHMCS integration of very popular developer tool available in most popular PHP frameworks PHP Debug Bar (http://phpdebugbar.com/) It adds footer line into your admin page (and yes, admin only for now) that can display information like:
Be the first to review Developers DebugBar.
The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
Initial release display information like:
After you download installation package, upload unpacked directory (nemc_debug_bar-master) into your modules/addons directory and rename it to nemc_debug_bar (remove "-master" part) and you are all ready to go.
Build, License & Distribute Your Own Apps using WHMCS
This addon allows your to add html / php to the header / footer in the admin area / admin login page / clients area
Generate, distribute and validate license keys
This module allows you to alter the language strings used throughout WHMCS.
WHMCS addon for expose a RESTful API