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I have been searching the nvidia website for the GPU Computing SDK as I am trying to build the pointclouds library (PCL) with cuda support. However, on the nvidia website all I can find are links for the toolkit and not a single download link for the SDK.
I found this post: How can I download the latest version of the GPU computing SDK?
However, that solution seems outdated and does not seem to work.
Try: https://developer.nvidia.com/cuda-downloads and select your architecture/OS
I think adding GPU support for other libs requires only the CUDA toolkit in most cases, which can be found publicly.
There is also a CUDA Compiler SDK.
It is located in the Registered Developers Website.
First, you have to register as a registered developer by this link.
After login, apply for the CUDA/GPU Computing Registered Developer Program
Then you can see the download link of CUDA Compiler SDK.
The link that fritzone gave (https://developer.nvidia.com/cuda-downloads) is an installer package that includes the CUDA toolkit, developer drivers, and the SDK. Since CUDA 4.2, NVidia has distributed all of these together in a single package. Older versions of CUDA still have them as separate downloads and are available from https://developer.nvidia.com/cuda-toolkit-archive.