glukoz writes:
A Beta build of UVPackmaster add-on for Blender 2.8 is now available. You can use it to test an efficient UV packing algorithm with the newest version of Blender.
Note that you don't have to spend a penny in order to check it out, as the demo version of the add-on is also available for Blender 2.8. You can download it directly here (make sure you download an add-on zip file with the 'blend2.8-beta' suffix).
The full versions of the add-on can be purchased at gumroad.