Ramses is an open source code to model astrophysical systems, featuring self-gravitating, magnetised, compressible, radiative fluid flows. It is based on the Adaptive Mesh Refinement (AMR) technique on a fully-threaded graded octree. Ramses is written in Fortran 90 and is making intensive use of the Message Passing Interface (MPI) library.
Download the code by cloning the git repository using
git clone https://bitbucket.org/rteyssie/ramses
You can read the user's guide.
Visit the code web site here.