Distribute Objects addon is Blender addon that allows arraying existing objects in your scene so they don't overlap in an orthogonal grid arrangement with configurable spacing.

Useful mainly in three situations:

1. Dealing with overlapping objects
2. When linking/appending multiple assets from an external  file at the same time.
3. Distributing different objects regularly over a scene like an array.

If you link Collection Instances into a scene they will often be placed at scene origin or 3D Cursor position all overlapping. You can't easily tell them apart or selected them.
With this addon separating them moving them is two mouse clicks away, easily incrementally moving them selected objects so the no longer overlap.

This may also be useful when populating a scene with different assets like distributing objects over a shelf, a table or along a street.

Disclaimers:

This is not another of those array addons that duplicate objects, or creates new ones. This is meant to array different already existing objects through your scene.

This addon does not take into account object size, it is not possible to distribute objects with equal spacing between them. Spacing is measured relative to object centers only, if selected object sizes vary widely they may end up overlapping in some situations or appear to space unevenly.

If your objects are already roughly in a grid array but are slightly misaligned, have eye balled positions or  imprecise locations that need fixing or cleanup, check out Transform Quantizer Addon