On this page, I host working examples of my free cPanel plugins.
Please keep in mind that this is only a PHP application that mimics the look and feel of cpanel, NOT a real cpanel demo. Why? Well, there are two reasons for this: first, cPanel needs a license, and second, this way the demo website doesn't require any maintenance from my end.
It is possible to host these demos without a cPanel because cPanel plugins are (usually) written in PHP. You can also publish them as standalone applications or plugins for another hosting panel, such as Aapanel or DirectAdmin.
For more awesome cPanel plugins visit cpanelplugins.com