Open-source project ZLUDA lets CUDA apps run on AMD GPUs | CG Channel
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Experimental tech lets NVIDIA-only apps, including RealityCapture and Arnold, run unmodified on AMD GPUs. Check out our FAQs on it.

Andrzej Janik has released ZLUDA 3, a new version of his open-source project that enables GPU-based applications designed for NVIDIA GPUs to run on other manufacturers’ hardware. The wrapper technology is designed to enable existing applications to run on new hardware unmodified, without the need for any work on their developers’ part.