Graphics Cards
AMD has better open source support than NVIDIA.
https://www.makeuseof.com/tag/use-amd-nvidia-gpus-linux/
SweetHome3D
GPU is not much help in rendering, but helps in 3D view.
http://www.sweethome3d.com/support/forum/viewthread_thread,2286
FreeCAD
FreeCAD does not appear to take advantage of GPUs either.
