.gltf
glTF modelGL Transmission Format
An open 3D format from the Khronos Group, first released in 2015. A JSON file describes the scene and points to separate binary buffers and texture images.
Exchanging real-time 3D scenes with materials and animation between tools and engines.
Opens in Blender, three.js, Godot, Unity and Unreal (with plug-ins)
About GLTF files.3mf
3MF model3D Manufacturing Format
A ZIP-based 3D printing format from the 3MF Consortium, founded in 2015 by Microsoft and others. Unlike STL it keeps units, colours, materials and several objects, and can carry print settings.
Ready-to-print projects with colours, multiple parts and printer settings.
Opens in PrusaSlicer, Bambu Studio, Cura, Windows 3D Builder
About 3MF files