.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.dae
COLLADA modelCollaborative Design Activity
An XML 3D interchange format created by Sony Computer Entertainment and now maintained by the Khronos Group. It holds geometry, materials, effects, skeletons and animation.
Exchanging models with older engines, SketchUp and Google Earth.
Opens in SketchUp, Maya, Cinema 4D, Quick Look on Mac
About DAE files