HPC with GPU/GPGPU on FreeBSD 8/9?

[O. Hartmann]

Does anyone of the FreeBSD folks out here use/develop/programme 
GPU-based scientific applications/libraries (mathematical nature, 
mostly) on FreeBSD natively running on FreeBSD with GPGPU support?
What are you using as 'language', framework, development environment? 
I'm desperately searching for solutions how to run n-body simulations 
GPGPU-supported on multi-processor 64Bit FreeBSD boxes with either 
nVidia or AMD GPU support.

Thanks,
Oliver