The problem with rigid body constraints in Vanilla Blender is, that you can only find out which objects are linked to it by relationsship lines (which become quickly messy if you have a lot) or by clicking on the physics button - but also there - you see just object names.

To have a quick solution for this, I created this add-on.

The add-on shows in two quick ways, which objects belong to a rigid body constraints.

1) by pressing the "inspect" button, all objects belonging to the constraint and the constraint will be shown in the local view

2) by pressing "colorize" all objects belonging to the constraint will be colored