VASP is likely to be top. I've not seen much use of abinit. Gromacs, charmm, and siesta don't use Fortran. See also cp2k, elk, quantum espresso, nwchem, and dl_poly, amongst others, which do, and are common. Gaussian is unfortunately common, and I think is Fortran. That's on top of important Fortran codes in ocean and meteorological modelling, and engineering. https://www.archer.ac.uk/status/codes/ has a lot of "other", partly because they don't log what actually runs with whatever is in the Cray compute node kernel which would do a similar job to audit, for instance.
I'd expect there to be a bunch of GROMACS/CHARMM time for the protein-folders too.