Dynamic Comp for After Effects is from the mind of François Leroy and allows you to share compositions between after effects projects. The Compositions are actually linked together to a reference project, so that one change can be seen dynamically updated in the After EFfects Projects using it.
Dynamic Comp allows you to share compositions between several After Effects projects
Simply select a composition in the After Effects Project Panel, and select the Export Composition button, then choose the composition in any After Effects Project using Dynamic Comp.
You are able to apply the reference project’s last made modifications to your new composition, or alternatively you can apply changes back to your reference project, making dynamic comp really flexible.
Dynamic Comp is available at AEScripts for a special price of $44.99 for two weeks only (until Apr 30, 2013). Check out the Dynamic Comp Script for After Effects here.