Believe or not, most programs used at NASA are in Fortran. I should add that the vast majority of these programs are not Fortran-90 but more often than not, F77 and frequently Fortran-II. The code used to generate thermal protection system material descriptions is incredibly nasty. It's a very archaic version of Fortran-II written as full spaghetti code (three way If statements, lots of Goto statements, all the nightmare stuff) and almost no comments. Many people have tried to sanitize this thing and failed. Now here's the really funny bit, people are writing ***new programs*** in Fortran. I've tried to argue with them that writing new code in an archaic language may not be the best idea. It's like arguing with a dung beetle that manure isn't delicious.

Gary