FreeCAD is a free and open-source CAD design software that allows you to view STP files. It can be used to view various other 2D/ 3D model files too, such as DWG, DXF, OBJ, DAE, PLY, IGS, IFC, STL ...

The NIST STEP File Analyzer and Viewer (SFA) generates a spreadsheet and a visualization from an ISO 10303 Part 21 STEP file. - usnistgov/SFA. Skip to content. Navigation Menu ... Open Source GitHub ...