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Gfortran is very nice, but I recommend a recent version (at least ver >= 7) rather than old versions (e.g. ver 4.4, which may still be the default on CentOS 6 etc). For performance, I guess Intel fortran is probably better (but also depends on calculations).

Thanks!

The best open source implementation is GFortran. Just make sure you use a recent version, as others mentioned.

Regarding commercial implementations, I only have experience with Intel and NAG, both of which are very good.

Everybody I know in public science (physics) uses gfortran, works just fine.

Good to know, thanks! I've used software compiled with the Intel compiler, but have only written some toy programs in GFortran and it seems fast enough. I like the revival idea behind LFortran though. Reading scientific C++ is much more difficult than Fortran.