• The DuMu^x module from IWS, University of Stuttgart.
• The Dune-modules from SINTEF ICT, Applied Mathematics.

You may obtain the current DuMu^x source code from the DuMu^x website, or directly from the public svn repository:
svn checkout --username=anonymous --password='' svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk dumux

A selection of programs from the SINTEF modules are available as a debian package (tested on Ubuntu 11.04).

The full source of the SINTEF modules are also available by Mercurial. The above debian package corresponds to the tag "opm-20110812" in the repository.

hg clone https://public.ict.sintef.no/opm/hg/dev

There is also a wiki page with build instructions.