.ply
PLY modelPolygon File Format
The Polygon File Format, also called the Stanford Triangle Format, devised at Stanford in the 1990s. It stores vertices and faces with extra properties such as per-vertex colour.
3D scans, point clouds and research data.
Opens in MeshLab, CloudCompare, Blender
About PLY files.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