We are currently working towards porting a Fortran application to AMD GPUs using HIP and ROCm and are interested in discussing this process in the GPU Developer Tools forum.
https://community.amd.com/t5/gpu-developer-tools/bd-p/gpu-developer-tools-discussions
We originally learned about ROCm and other AMD GPU products from @guy_ludden and have noticed relevant posts around general purpose programming for GPUs from this forum user in the GPU Developer Tools forum.