Fortran is one of the premier languages for numerical analysis and
high performance computing. On average about half the applications on
supercomputers are written in Fortran. Fortran compilers are currently
available on all XSEDE platforms, including Stampede at TACC.
Fortran has a long history. It was developed in 1954 as the first
high-level programming language. Legacy code conforming to the former
FORTRAN 77 (and earlier) standards is now called "old" Fortran. About
25 years ago, a major effort was made to modernize the language, and
a "new" Fortran was born. Its name declares (in mixed case) the year
of its arrival: Fortran 90.
Since then, updates have been made to the standard in 1995 (Fortran
95), 2003 (Fortran 2003), and 2008 (Fortran 2008). Informally, these
standards are nicknamed F90, F95, etc. Current compilers support the
full F90 and F95 standards, as well as many features of F2003, and
some features from F2008. Today, Fortran continues to evolve steadily
to fit the needs of the (super)computing community.