Blender - Blender is the open source, cross platform suite of tools for 3D creation.
SimFlow - SimFlow is a powerful CFD software, focused on engineering and science.
FreeCAD - An open-source parametric 3D modeler
ANSYS Fluent - ANSYS engineering simulation and 3D design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics foundation.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
COMSOL Multiphysics - COMSOL is the developer of COMSOL Multiphysics software, an interactive environment for modeling and simulating scientific and engineering problems.