Why FreeCAD:
FreeCAD is opensource and free software for 3D modelling;
It has many tools and addons for specific task for design 3D models (CFD, FEA addons);
It has powerful API based on Python. With using Python API you can create new tools;
In present time FreeCAD can be alternative for personal using, because commercial CAD software is very cost;
FreeCAD available for Windows and Linux systems.
If you have any questions or suggestions please write me to e-mail: [email protected]