UVPackmaster 2 is an efficient and fully-featured UV packing engine available for Blender and 3ds Max. It is probably the most efficient UV packer out there in terms of packing on CPU but it also provides a Cuda accelerated variant of the algorithm. When running on a GPU it significantly outperforms all other packers available.

UDIM support and other new features: https://youtu.be/j9mDki-OsiU
To learn more about the packer visit our site: https://uvpackmaster.com/uvpackmaster-for-blender/
Download add-on demo from here (no login needed): https://uvpackmaster.com/downloads/
Available also as a plugin for 3ds Max: https://uvpackmaster.com/uvpackmaster-for-3ds-max/