JiggleArmature is an easy way to create
wiggle effects in blender, just enable jiggle bone on the bones you want to be jiggly.
This addon is intended for adding quickly and automatically, secondary animations
to your rigged characters or objects, you can save many time!
Features:
Quick setup of jiggle bones
Constraints for stretch, volume and shape
Test mode for real time preview of the simulation
Animation baking
Jiggle bone control (Experimental)
Limitations:
Currently not supported jiggle effect of rotation about bone axis
Simulation behavior is dependent on the frame rate