# glTF Resources > **For users.** A curated collection of external links (models, HDRIs, specifications, and tools) to support work with the glTF 3D file format — a starting point for exploring and using glTF assets. ## glTF Models * **Models downloadable from CMake's "Configure" action** : Look into `CMakeLists.txt`, in the "*Adding download resources*" section : you can uncomment models we provided for our samples. They will be downloaded into the *_downloaded_resources* folder. * [glTF Sample Assets](https://github.com/KhronosGroup/glTF-Sample-Assets) : glTF V2.0 Sample Assets * [Sketchfab](https://sketchfab.com/3d-models?features=downloadable&sort_by=-likeCount) : A huge collection of downloadable models. * [Polycam](https://poly.cam/3d-models/gltf-models) : GLTF 3D Models * [Smithsonian](https://3d.si.edu/) : 3D scanned glTF * [Kenney](https://kenney.nl/assets/category:3D) : Game assets * [Amazon Lumberyard Bistro](https://github.com/zeux/niagara_bistro) : edited version of Amazon Lumberyard Bistro from NVIDIA's samples * [RTXPT-Asset](https://github.com/NVIDIA-RTX/RTXPT-Assets) : Assets for the NVIDIA RTX Path Tracing. ## HDR (Environment maps) * [Poly Haven](https://polyhaven.com/hdris) : offers CC0 (public domain equivalent) HDRIs, PBR textures, and glTF models. ## Information * [Khronos glTF](https://github.com/KhronosGroup/glTF) : Landing page * [glTF Specification](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html) * [glTF Extensions](https://github.com/KhronosGroup/glTF/blob/main/extensions/README.md) : List of current glTF extensions * [glTF Tutorial](https://github.khronos.org/glTF-Tutorials/gltfTutorial/) : This tutorial gives an introduction to glTF ## Tools * [glTF-Transform](https://github.com/donmccurdy/glTF-Transform) : glTF Transform supports reading, editing, and writing 3D models in glTF 2.0 format * [glTF-Validator](https://github.com/KhronosGroup/glTF-Validator) : Tool to validate glTF assets