Last year Radeon Rays 4.0 brought Vulkan support while dropping OpenCL and at the same time no longer being open-source… This GPU-accelerated ray intersection library used by the likes of Radeon ProRender is out today with version 4.1 and now it’s back to being open-source…

Source: Phoronix – AMD Publishes Radeon Rays 4.1 As Open-Source