OpenCL is currently managed by the Khronos Group, a non-profit consortium of companies that collaborate in defining the specifications of this (and many other) standards and compliance parameters for the creation of OpenCL-specific drivers for each type of platform.

These drivers also provide functions for compiling programs that are written in the kernel language: these are converted into programs in some form of intermediate language that is usually vendor-specific, and then executed on the reference architectures.

More info on OpenCL can be found at the following link: https://www.khronos.org/registry/OpenCL/.