– True Comp Duplicator (for duplicating a comp and any precomps it contains)
– Gridder (arranges layers in a grid)
– LayerRandomShifter (user sets parameters and layers will randomly shift in time)
– 3D Layer Distributor (again, you set parameters and then layers will be moved randomly in 3D space)
– Ease and Wizz, though I find it somewhat finicky.
All of these can be found on AEscripts.com