What is hierarchy to collections ?
Hierarchy to collections is an addon which allows you to have both empty hierarchy (from Maya or 3Ds Max import) and a collections hierarchy in the same file.
From Maya, Blender 2.79 or 3dsMax to Blender 2.80+
If you import a model from Maya for example, it will gives you an empty hierarchy. With this add-on, you can convert it in a collection hierarchy easily !
From Blender 2.8+ to another software
You have also the opportunity to convert collection hierarchy to an empty hierarchy, in order to share your model with other softwares.
You can buy it here (and check my other workflow addons : Origins to floor, Set Output Path, Selection Sets and Snapshot files)