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Kactus2 has a basic C++ plugin interface for extending the functionality of Kactus2 via .dll/.so plugins. The plugins are implemented as standard Qt plugins (see http://doc.qt.io/qt-6.2/plugins-howto.html).
As an introduction to plugin development, you should first try the sample plugins as instructed in the plugin development document, as well as see the plugin API. The plugin API gives an insight to the different plugin types. Moreover, Kactus2 source code comes with existing plugins, which may give you further hints about how to implement functionality to plugins.