GridFormat

DuMux - DUNE for Multi-{Phase, Component, Scale, Physics, …} flow and transport in porous media and more. The swiss army knife of porous media research. Open-source simulator in modern C++.

DUNE, the Distributed and Unified Numerics Environment, is a modular toolbox for solving partial differential equations (PDEs) with grid-based methods. It supports the easy, flexible, and efficient implementation of finite element and volume methods. DUNE is C++ code and also has a Python interface.