Create an instance of an effect with one click. Behind the scenes the script makes a copy of the effect and links it with expressions in a way that allows the instance to be anywhere including a different comp.

Scans footage and removes duplicate frames by setting hold keyframes on the layer’s time-remapping channel.

Creates a complete duplicate of a comp hierarchy including subcomps.

Make a copy of a layer and link all its properties to the original using expressions.

Duplicates the selected layers and if any of the layers have expressions referencing any of the layers being duplicated it will update the expressions to point to the newly duplicated layers. Might make more sense if you watch the demo