Springy FX is a Fremox toolset for After Effects built entirely around jiggling secondary motion. It adds overlapping springy action to your layers based on their keyframed transform properties, whether you want a cartoon look or subtler overlapping action on your animations. The set includes nine tools, presented as buttons with icons that you can arrange as a horizontal row or a vertical column, with or without labels.
To use a position-based tool such as Bend, Shear, Squash & Stretch, Jiggle or Liquid, you select a layer with keyframed motion on its position and click the tool. The layer needs to be a solid, footage or precomp, since Shape and Text layers can't be deformed properly this way. A Bulge deformer can be driven by an animated scale and a Twist deformer by animated rotation, while the springy Parent constraint makes one selected layer follow another with a springy delay.
The Custom effect handles springy motion on numeric single-dimension properties that belong to an effect, including plugin properties like Element 3D or Joystick 'n' Sliders. Version 1.5 adds a dynamic Rope Connection that draws a springy rope as a Shape layer path between two selected layers.