HelpDeskZ is a free PHP based software which allows you to manage your site's support with a web-based support ticket system.
If you are specifically looking for a "MOD" or a version not on the Play Store, you would typically download an APK file from a site like APKModGet. Modified APKs can contain hidden malware or trackers. How to Install: Download the APK file from the source.
For the safety of your device and your personal data, it is highly recommended to stick to the official Play Store or legitimate subscription services. If you must download a modded APK, understand that you are acting as your own security guard—and the risks are high. play store apkmodget