MRST

MRST is a free open-source software for reservoir modelling and simulation. Like Matlab, MRST is not primarily a simulator, but is mainly intended as a toolbox for rapid prototyping and demonstration of new simulation methods and modeling concepts. To this end, the toolbox offers a wide range of data structures and computational methods you can easily combine to make your own custom-made modelling and simulation tools. Nonetheless, MRST also offers quite comprehensive black-oil and compositional reservoir simulators capable of simulating industry-standard models, as well as graphical user interfaces for post-processing simulation results.