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 SolveSpace. Other great apps like FreeCAD are Autodesk AutoCAD, SOLIDWORKS, Onshape and LibreCAD.
Both can do parametric modelling. While OpenSCAD focuses on your whole design being described in code, FreeCAD allows you to draw a sketch and add parameters as needed.