Homepage: https://www.uv-packer.com/
Download: https://www.uv-packer.com/blender/
Documentation: https://docs.3d-plugin.com/
https://docs.3d-plugin.com/unwrellaconnect-blender
UnwrellaConnect for Blender is an extension that seamlessly connects Blender to our standalone UV editing applications, allowing you to run their powerful functionality directly from within the Blender interface – no need to leave your workflow.