UVPackmaster 3 DEMO version is going to be released soon. Until it happens, you can try UVPackmaster 2 DEMO for free to get an idea of algorithm efficiency.
The UVPackmaster 2 DEMO version provides all functionalities of UVPackmaster 2 PRO (including GPU-accelerated packing) but it doesn’t apply the result to the UV map, only renders it in a separate window.
In order to set up the demo in Blender, download the files:
and follow the setup guide (the Installer method).