FreeCAD is described as 'A versatile open-source 3D CAD modeler with modular architecture, suitable for engineering applications across multiple platforms, supporting Python scripting' and is a very popular CAD software in the photos & graphics category. There are more than 100 alternatives to FreeCAD for a variety of platforms, including Windows, Mac, Linux, Web-based and SaaS apps. The best FreeCAD alternative is SketchUp. It's not free, so if you're looking for a free alternative, you could try OpenSCAD or Onshape. Other great apps like FreeCAD are Autodesk AutoCAD, SOLIDWORKS, SolveSpace and BRL-CAD.