Modular Body Groups is an add-on that provides a user interface for organizing, customizing, and switching mesh components on a rig. It allows you to create variations of objects by grouping different components together. The tool supports multiple spawn types including exclusive drop-downs, inclusive checkboxes, dependent choices based on other groups, and randomized selections. It can be used for managing character cosmetics like clothing and heads, vehicle parts, architectural elements, or setting up level-of-detail variations and destruction states. A Pro version adds the ability to animate body groups and separate them into individual active objects while retaining switching functionality.