Arma 3: Curator
Curator is a technical name for Arma 3 Zeus game master system. Every involved scripting command, event handler or class name contains the name. The reason for it is to have a generic name which can be passed from project to project without any associations.
The central piece of every curator is Game Master module, otherwise referred to as Curator Logic. It stores every setting, like editing areas, available objects or their costs.
You can find the module in Modules (F7) > Zeus > Game Master
In module arguments, can set the curator unit (either specific unit, player with given UID or server admin) and that's all you need to add game master to your mission. Without any further settings, all objects will be available for free and whole map will be editable.