Trigger

Quickly setup and retime animations by triggering animations inside a precomp using layer markers. Easily create Trigger comps, add markers, and trigger animations from inside a precomp . Turn your linear workflow into an automated event based workflow, allowing you to non-destructively retime complex animations, easily test out multiple versions of an animation, and sequence together multiple animation events easily from your global composition.

http://aescripts.com/trigger/