Apart from custom activities created in ELMA Designer, there are certain activities that can be included in ELMA if corresponding applications are installed and activated in the system:
ELMA CRM+ custom activities
ELMA Projects+ custom activities
Fig. 1. Custom activities of ELMA BPM applications.
Even though these activities are considered custom, they are in fact system activities, so you cannot edit or delete them. However, you can copy them from the context menu on the Scripts tab of ELMA Designer and make your own versions of these activities.