OpenFOAM - OpenFOAM® - Official home of The Open Source Computational Fluid Dynamics (CFD) Toolbox.
MATLAB - A high-level language and interactive environment for numerical computation, visualization, and programming
ANSYS Fluent - ANSYS engineering simulation and 3D design software delivers product modeling solutions with unmatched scalability and a comprehensive multiphysics foundation.
C++ - Has imperative, object-oriented and generic programming features, while also providing the facilities for low level memory manipulation
D (Programming Language) - D is a language with C-like syntax and static typing.
Wolfram Mathematica - Mathematica has characterized the cutting edge in specialized processing—and gave the chief calculation environment to a large number of pioneers, instructors, understudies, and others around the globe.