An additional application is installed by uploading an installation package in a special format in the system. Using the information about the format of the application installation package and the external API for Plesk, third-party developers can create their own enhancements for operating systems, while hosting providers can easily integrate them in the control panel interface meeting thus customer requirements. 

Packs can be installed both for free access and usage, and for a commercial usage, when you have to pay to be able to use the application. At any time, you can make a free application a commercial one or vice a versa using the control panel.

All packs installed in the system are placed in the centralized archive, which can be expanded when necessary.