Just to see if it worked, I downloaded SWIFT to my computer at home, which is running Windows XP Pro SP3 with Cygwin.
It compiled successfully using gfortran (GNU Fortran90) under Cygwin.
gfortran is available for both MacOS and Linux.
There was one warning when I tried the example:
Warning: The size of istat and rstat arrays is
not NSTAT = 53, but is 13
I don't know what that implies.
Unfortunately, I couldn't find anything detailing what the example output is supposed to be. Without that, it's a little hard to verify that the calculations are producing the correct results.