From: https://scicomp.stackexchange.com/questions/304/c-vs-fortran-for-hpc https://scicomp.stackexchange.com/questions/304/c-vs-fortran... "Sorry for digging

From: https://scicomp.stackexchange.com/questions/304/c-vs-fortran-for-hpc https://scicomp.stackexchange.com/questions/304/c-vs-fortran... "Sorry for digging up an old thread but it seems that even in 2015, Fortran is being used a lot. I just came across this (alternate link) list which basically is a list of 13 codes approved by DOE's OCLF facility to run on the 300-petaFLOPS Summit machine which will be made available to researchers in 2018. I tried to find the main language used for the code (based on a quick google search) and here is what I found: XGC Fortran SPECFEM Fortran ACME Fortran (Bunch of climate codes) DIRAC Fortran (Mostly) FLASH Fortran GTC Fortran HACC C/C++ LS-DALTON Fortran (some C) NAMD C/C++ NUCCOR Fortran NWCHEM Fortran QMCPACK C++ RAPTOR Fortran" Note: QMCPACK is written in C++ but depends on LAPACK which is again Fortran.