Be careful what you download, even if it is claimed that it is for a good cause. It wouldn't be the first time someone has misused a time of crisis to gain profit for themselves. Not saying that is the case here but like always: "Don't trust. Verify"!

FAH is built from several open source tools, namely Gromacs (http://www.gromacs.org), TINKER (http://dasher.wustl.edu), and AMBER (http://ambermd.org/) for MD packages and MPICH for MPI (http://www-unix.mcs.anl.gov/mpi/mpich/). If you’re interested in checking out these codes, you should feel free to download them and check them out. One can compile a SMP version of Gromacs by using the latest Gromacs with MPICH. This would reproduce the SMP clients we have on FAH.

Most of the critical parts of FAH are publicly available. The Tinker and Gromacs source codes can be downloaded and run. Unlike many computer projects, the paramount concern is not functionality, but the scientific integrity, and posting the source code in a way that would allow people to reverse engineer the code to produce bogus scientific results would make the whole project pointless. However, we stress that the vast majority of our code is already open source. We have an Open Source FAQ with more details.