Parts of AMD ROCm (HIP & others) are available on Tumbleweed

English Hardware
1

Main manual:
https://en.opensuse.org/SDB:AMD_GPGPU#GPGPU_on_openSUSE_Tumbleweed

openSUSE provides some packages with GPU:ROCm repository.
For instance, installing AMD HIP (openSUSE Software):

zypper addrepo https://download.opensuse.org/repositories/science:GPU:ROCm/openSUSE_Factory/science:GPU:ROCm.repo 
zypper refresh 
zypper install hip

Add GPU:ROCm repository into your system to see all available packages. This openSUSE-Factory repo is incompatible with Leap.

After getting HIP you can run Blender & other stuff on HIP (not tested).
After installing ZLUDA you can get CUDA support and run Blender on CUDA backend. Full path will be Blender → CUDA → ZLUDA → HIP → GPU. Blender runs about 20% faster on CUDA-ZLUDA compared to direct HIP usage.

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https://software.opensuse.org/package/aomp

provides AOMP 18.0.0.

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AMD OpenCL package is available:

https://download.opensuse.org/repositories/science:/GPU:/ROCm/openSUSE_Factory/x86_64/amd-opencl-18.0.0-1.118.x86_64.rpm

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Installing OpenCL driver:
https://software.opensuse.org/package/amd-opencl

zypper addrepo https://download.opensuse.org/repositories/science:GPU:ROCm/openSUSE_Factory/science:GPU:ROCm.repo
zypper refresh
zypper install amd-opencl

This will install these files:

/usr/lib64/libamdocl64.so
/usr/share/OpenCL/vendors/amdocl64.icd
/usr/share/doc/packages/rocm-ocl-icd/LICENSE