Khronos Standard: glTF
fastgltf
A modern C++17 glTF 2.0 library focused on speed, correctness, and usability
Minecraft MCglTF
migenius RealityServer
Titania X3D Editor
3ds Max Importer/Exporter
MATLAB-GLTF
MATLAB class to export 3D graphs and other content to glTF.