.wrl
VRML worldVirtual Reality Modeling Language
A text format for 3D scenes from the mid-1990s, made to describe interactive worlds on the early web. VRML97 became an ISO standard and was later succeeded by X3D.
Older CAD and scientific models, and full-colour 3D printing.
Opens in MeshLab, FreeCAD, view3dscene, Blender (with an add-on)
About WRL files