ANSYS Fluent - ANSYS engineering simulation and 3D design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics foundation.
FreeCAD - An open-source parametric 3D modeler
OpenFOAM - OpenFOAM® - Official home of The Open Source Computational Fluid Dynamics (CFD) Toolbox.
SketchUp - 3D for Everyone
Simscale CFD - SimScale CFD is a cloud-based leading CAE platform that offers access to CFD, FEA, and thermodynamics simulation capabilities 100% via a standard web browser.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.