Blender: Unreal Engine IK Bone Snapper

This is a blender plugin for snapping Unreal IK bones to their FK counterparts after retargeting in Unreal Engine: Rather than clicking ten billion times in the Snapper tool, you can just press one button in Unreal for any number of animations to be corrected automatically.

The attached video fully explains this addon's use, as well as how to deal with Unreal's retargeting and batch import bugs (as my addon does not solve them, but I demonstrate how to do so in three simple steps after reimporting the corrected animations.)