Fortran has over a dozen open source and commercial compilers.
Fortran has through many revisions, the most well known are the 66, 77, 90, 95, 03, and 08 standards. It is often said that the reason Fortran is still used is that it is fast.
The features deemed obsolete in Fortran 90 are not available in Fortran 95 (they are actually obsolete). The first, and most obvious, change from FORTRAN 77 to Fortran 90 is the conversion from fixed source code to free source.
Its market share has been slowly being eaten away by Matlab, Python, C/C++, and now Julia is the current Fortan-killer. I think actually that Julia has the most potential to replace it and finally killing it, since it attracts exactly the same target than Fortran.
What Fortran compilers are there in this day and age, and which would you recommend? Please list the version of Fortran it supports, the platform it works on (e.g. *nix / Windows), and whether it cost money.
(Standard OS one per answer etc.)
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