Physically-Based Rendering in glTF 2.0 using WebGL
The main features of khronosgroup/gltf-sample-viewer are: Asset Validation and Testing.
Open-source alternatives to khronosgroup/gltf-sample-viewer include: bghgary/gltf-asset-generator. khronosgroup/gltf-sample-models — glTF Sample Models.
glTF Sample Models