Animation Snapper Pro is a Blender addon that helps with dynamic parent switching (a.k.a. space switching). This is a very common and tricky issue in 3D animation.

The addon can also be effective in motion capture cleanup.

This tool simplifies the process of space switching: instead of complicated constraints, it just bakes the desired relationship between two objects or bones to keyframes for a specified time-range.

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So objects appear to be parented when in fact they may not be. This way complex parent-switching effects can be achieved without complicated setups.
Animation Snapper Pro

Quick Overview by CGDive

Animation Snapper Pro video

Tutorial Playlist by the addon developer

Animation Snapper Pro video