.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.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