CAD-dat

Cloud-based Tools:

• Onshape: You can upload the .PRT file and see if Onshape can automatically recognize it and allow you to work with it or convert it to another format.
• GrabCAD Workbench: This platform may also support .PRT files, especially if it’s a standard PTC Creo file.

Onshape

opensource 3D

• freeCAD

opensource 2D

• libreCAD

• CNC-dat

ref

• CAD