ANSYS Fluent - ANSYS engineering simulation and 3D design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics foundation.
GNU Octave - GNU Octave is a programming language for scientific computing.
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.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
CFDTool - An Easy to Use MATLAB Computational Fluid Dynamics CFD Simulation GUI Toolbox
Xcos - Xcos is a graphical editor to design hybrid dynamical systems models.