UVPackmaster 2 is an efficient UV packing engine available as a command line tool. Its robustness comes not only from the fact that it was written in C++ and runs as a multi-threaded application - it also provides a packing algorithm for Cuda-enabled GPUs (what gives a significant boost). In fact, it can perform some packing operations on all devices simultaneously: CPU and all GPUs in the system.
The engine can be used together with Blender 2.8x with the UVPackmaster add-on installed.
