The Khronos Group

The NNEF Tools repository contains tools to generate and consume NNEF documents

The OpenCL Conformance Tests

Vulkan Validation Layers

SPIRV-Reflect is a lightweight library that provides a C/C++ reflection API for SPIR-V shader bytecode in Vulkan applications.

Test Suite (Black Box) for KTX-Software

SYCL Conformance Tests

OpenXR Specification sources and related material

OpenCL API, OpenCL C, Extensions, SPIR-V Environment Specs, Ref page, and C++ for OpenCL doc sources.