vfxguide

Ocd (One Click Damage) is a Blender add-on that adds procedural wear and damage to mesh objects, from subtle surface wear to deep scars, suited to stone, concrete, wood and brick structures.

Cracker is a Blender add-on for making cracks on real geometry. Select an object, press Ctrl + W, adjust the look, and apply. It also includes Stomper impact, Material Breaker glass shattering, and physics-based grounding.