sdk

3D model format specification and single header SDK. Supports skeletal animations, voxels and has the best data density

https://dcs.cemetech.net/ Doors CS documentation web site

GPL-licensed HLSDK (reimplemented using the original Quake engine and manually rewritten sources)

A simple implementation of the ArborXR SDK (https://documentation.xrdm.app/docs/devicepublicapi/) for Unreal Engine.

Latest OpenCV Android SDK with opencv_contrib, built with LLVM.