Python Plugin Manager
This is part of Krita's python support.
The python plugin manager can be accesed from. It allows you decide which of the Python Plugins are active.
It will show you a list of python plugins Krita has found, as well as their description. By default, Python Plugins are disabled, because many python scripts are autostarted, so this ensures only the ones you want to run are being run.
You can use the checkboxes to toggle them. A restart is required to complete switching off or on the python plugin.
For more information on python, check the python scripting category.