The gap
Imported and kitbashed models arrive with origins in random places, and Blender's own Set Origin only offers geometry centre, cursor or centre of mass, so putting origins at the base of many objects and then lining them up takes a chain of manual steps.
What it is
Pivotry moves origins to any bounding-box point, the cursor or the selection for the whole selection in one undoable step, without moving geometry, and adds floor snapping, bounds-based align and distribute, and a raycast drop onto other objects.
How you use it
One click puts every selected object's origin at its base and drops it on the ground, and you can trust that nothing visibly moved.
A focused origin and placement tool for Blender users who set up scenes from many separate models, smaller than a full layout suite and tested at the vertex level.