https://github.com/baldurk/visor Vulkan Software Renderer
https://github.com/Chabloom/VulkanOnD3D12 Vulkan to Direct3D 12
https://github.com/msiglreith/rostkatze Vulkan to Direct3D 12
https://github.com/gfx-rs/portability Vulkan to Direct3D 12 and Metal and also to Vulkan itself again
https://github.com/KhronosGroup/MoltenVK Vulkan to Metal